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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    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        Home > Transportation 
        Home Page > Appendix BEstimation Methodologies**Introduction**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|**Appendix B**
      **Estimation Methodologies**
      **Introduction**
            Statistics 
              concerning vehicle miles traveled (VMT), vehicle fuel efficiency 
              (given in terms of miles per gallon (MPG)), vehicle fuel consumption, 
              and vehicle fuel expenditures are presented in this report. The 
              methodology used to estimate these statistics relied on data from 
              the 1993 Residential Energy Consumption Survey (RECS), the 1994 
              Residential Transportation Energy Consumption Survey (RTECS), the 
              U.S. Environmental Protection Agency (EPA) fuel efficiency test 
              results, the U.S. Bureau of Labor Statistics (BLS) retail pump price 
              series, and the Lundberg Survey, Inc., price series for 1994.
            The 
              estimation of these four statistics (VMT, vehicle fuel efficiency, 
              vehicle fuel consumption, and vehicle fuel expenditures) occurred 
              in several steps (Figure B1). First, for each RTECS vehicle, the 
              VMT were determined from two actual odometer readings or imputed 
              using data from the 1993 RECS. Second, the annual on-road fuel efficiency, 
              given in terms of MPG, was estimated using the questionnaire responses, 
              decoded Vehicle Identification Number (VIN) data, EPA fuel efficiency 
              test results, and the months that the vehicle was in use. The MPG 
              were adjusted to account for the difference between EPA test values 
              and on-road values. Third, estimated vehicle fuel consumption was 
              derived by dividing the VMT by the estimated MPG. Finally, the estimated 
              vehicle fuel expenditures were derived by multiplying the vehicle 
              fuel consumption by the fuel price. The 1994 RTECS, like the 1988 
              RTECS, did not collect vehicle fuel prices via fuel purchase diaries. 
              Instead each RTECS vehicle was assigned a price based on reported 
              fuel type used in each vehicle. Gasoline prices were obtained from 
              the BLS 1994 Retail Gasoline Pump Price Series. Diesel fuel prices 
              were obtained from the Lundberg Survey, Inc. (See "Other Fuel 
              Types" in this appendix for a discussion of the gasohol and 
              propane prices.)
            The 
              following sections of this appendix describe the estimation procedures 
              used for calculating the VMT, the MPG, the vehicle fuel consumption, 
              the vehicle fuel prices, and the vehicle fuel expenditures. Also 
              described in this appendix are the sources of data that were used 
              in the estimation procedures.
            The 
              following terms are used throughout this appendix:
            **Terms**
                **Definitions**EPA 
                  Composite MPG
                The 
                  EPA dynamometer test procedure, performed on preproduction prototype 
                  vehicles, yields separate test values for EPA city and highway 
                  MPG. These city and highway MPG are often combined to form the 
                  "composite" MPG.On-Road 
                  MPG
                A 
                  composite MPG that was adjusted to account for the shortfall 
                  between the test value and the fuel efficiency actually obtained 
                  on the road. The adjustment did not take into account the driving 
                  patterns of individual drivers and seasonal differences.In-Use 
                  MPG
                MPG 
                  that were adjusted for seasonal differences and annual miles 
                  driven. Vehicles that are driven relatively few miles during 
                  the year are assumed to be driven mostly on short trips that 
                  involve frequent stops. Vehicles that are driven relatively 
                  many miles are assumed to be driven mostly on long trips where 
                  few stops are needed.MPG 
                  Shortfall
                A 
                  measure of the difference between actual on-road MPG and the 
                  EPA laboratory test MPG. Expressed as the ratio of test MPG 
                  to on-road MPG.**Vehicle 
              Miles Traveled**
            When 
              possible, VMT were determined for a sample vehicle by taking the 
              difference between two odometer readings, which spanned a period 
              of time. This method was used to determine VMT for 2,648 (48 percent) 
              of the 5,553 RTECS sample vehicles. Attempts were made to obtain 
              odometer readings during the RECS interviews, the End-of-Year (E-O-Y) 
              RTECS interview and any time a vehicle was acquired or disposed. 
              A "span" of odometer readings was the difference between 
              two odometer readings. In most cases, this span was a B-O-Y to E-O-Y 
              span, although due to an occasional nonresponse, only shorter spans 
              were obtained, such as RECS to B-O-Y. Odometer spans of less than 
              a full year were also obtained for vehicles that were either acquired 
              or disposed of during the survey year.
            The 
              VMT that were assigned to each RTECS vehicle corresponded to the 
              period of time that the vehicle was in possession by the sample 
              household. In most cases, however, this period of possession did 
              not correspond exactly with the beginning and ending dates for the 
              odometer span. This was true even for vehicles with a complete B-O-Y 
              to E-O-Y odometer span; because odometer cards were mailed to respondents 
              in several distinct waves at the beginning and end of the RTECS 
              survey; and because the exact dates of odometer readings were often 
              left to the convenience of the respondents. Therefore, all VMT obtained 
              from odometer spans were adjusted to correspond to the period of 
              time that the vehicle was in possession by the sample household. 
              A 2-step adjustment procedure was used. STEP 1 adjusted the odometer-span 
              VMT to a standard annualized mileage covering 365 days, and STEP 
              2 readjusted the annualized VMT to correspond to the exact period 
              of time that the vehicle was in possession by the household. These 
              adjustments took into account a typical distribution of VMT fractions 
              among the different months of the year. Step 2 was performed only 
              for vehicles that were not in the possession of the household for 
              the entire calendar year 1994.
            **STEP 
              1:**
            This 
              step adjusted the odometer-span VMT to a standard annualized VMT 
              covering a full year, regardless of whether the span of odometer 
              readings covered approximately 1 year or only a short span of time. 
              Annualized VMT for vehicle i were computed as:
            
            Where: Fj 
              = Monthly VMT fractions from the standard distribution in Table
              B1 soi 
              = Month of starting odometer readings for vehicle i 
              eoi 
              = Month of ending odometer readings for vehicle i. 
              The 
              starting and ending Fj were prorated according to the 
              exact day of the month for the odometer readings. For example, if 
              a final odometer reading was taken on September 15, then (14/30) 
              x FSEP was used.
            **Table
              B1.Distribution of Average Monthly Vehicle Miles Traveled Fractions**
            Month 
                    j
                Average 
                    VMT per Vehicle
                FjJanuary
                688
                0.0728February
                697
                0.0738March
                771
                0.0816April
                783
                0.0829May
                832
                0.0880June
                847
                0.0896July
                868
                0.0919August
                872
                0.0923September
                800
                0.0847October
                802
                0.0849November
                756
                0.0800December
                734
                0.0777Total
                9,450
                1.0000Source: 
              1984 Petroleum Marketing Index (PMI) Survey, NPD Research Inc. The 
              survey is a demographically and geographically balanced-quota sample 
              of 4,100 households. Respondents maintained fuel purchase diaries 
              for an average of 10 months. As part of the survey, information 
              was collected on the characteristics of trips taken in vehicles 
              during a designated day. Trip lengths were recorded as respondent 
              perception rather than from odometer readings. The distribution 
              of monthly mileage fractions has been obtained from this survey.
            **STEP 
              2:**
            Once 
              an annualized VMT was obtained from STEP 1 as described earlier, 
              it was adjusted to correspond to the time period that vehicle i 
              was in possession by the sample household as:
            
            Where:
            Fj 
              = Monthly VMT fractions from the standard distribution in Table
              B1
            spi 
              = Month starting possession of vehicle i by the household, or January 
              1994, whichever is later
            epi 
              = Month ending possession of vehicle i by the household, or December 
              1994, whichever is earlier.
            If 
              vehicle i was in the household for the entire year then spi 
              = JAN and epi = DEC. If a vehicle was acquired or disposed 
              of during the survey, the starting or ending Fj was prorated 
              according to the appropriate day of the month.
            To 
              ensure that the distribution of average monthly vehicle miles traveled 
              fractions given in Table B1 reflected 1994 driving patterns, a study
              of Federal Highway Administration (FHWA) Traffic Volume data for 
              1994 was conducted. This study resulted in FHWA VMT fractions being 
              constructed for 1984 and 1993. FHWA 1993 data were used since the 
              1994 data for the entire year was unavailable. Annual VMT calculations 
              were completed using both the NPD and FHWA fractions. The differences 
              in average annual VMT per vehicle between using the NPD and FHWA 
              VMT fractions ranged between 1 and 18 miles and were less than the 
              standard errors of the average annual VMT. Therefore, in 1994 the 
              NPD VMT fractions given in Table B1 will be used to compute annualized
              VMT since the differences in annual VMT between using the NPD and 
              FHWA fractions were minor (RTECS Technote 5[3]).
            **Incomplete 
              Odometer or VMT Data**
            For 
              1,927 sample vehicles (35 percent), no odometer span was available, 
              although an estimate of annual VMT had been obtained from the respondent 
              during the RECS interview. VMT for these vehicles were imputed from 
              a regression on the estimated VMT obtained from the RECS. For another 
              978 sample vehicles (17 percent), no odometer span was available 
              and a VMT estimate was not obtained during the RECS interview. VMT 
              for these vehicles were imputed using a multiple linear regression 
              model, where the independent variables were number of drivers, household 
              income, age of household head, type of vehicle, and use of vehicle 
              on the job. This regression was also used for imputing VMT for vehicles 
              that were imputed as being acquired or disposed. Both of the regression 
              models described above yielded estimates of annualized VMT. The 
              STEP 2 adjustment described previously was then used to adjust this 
              VMT to correspond with the time the vehicle was in the possession 
              of the household.
            **Vehicle 
              Fuel Efficiency**
            Fuel 
              efficiency (MPG) must be estimated for each RTECS sample vehicle 
              in order to estimate each vehicle's fuel consumption for the survey 
              year. (Fuel consumption is estimated by dividing the VMT for time 
              of possession, by the MPG.) Prior to 1988, the RTECS obtained actual 
              fuel consumption data and on-road MPG from fuel purchase diaries 
              maintained by the respondents. However, no fuel purchase diaries 
              were used in the 1988 thru 1994 RTECS. Instead, the 1994 MPG were 
              estimated using EPA laboratory test MPG that were adjusted to account 
              for differences between actual on-road MPG and the EPA test MPG. 
              This difference is known as MPG "shortfall." The feasibility 
              of using shortfall-adjusted MPG in an RTECS survey was investigated 
              by Lax, 1987[6]. That study verified that the method yielded unbiased 
              MPG, when using a data base from a 1984 fuel purchase diary study 
              performed by NPD Research, Inc. The adequacy of current shortfall 
              adjustment methods is sufficient for late 1980 through early 1993's 
              motor vehicle model years also (RTECS Technote 5[3]).
                    The 
              RTECS sample vehicles were assigned EPA test MPG from the EPA Emissions 
              Certification Files. Each record of the Certification Files contained 
              EPA test MPG for each unique combination of vehicle attributes within 
              a given make, model, and year. These attributes were (1) number 
              of cylinders, (2) cubic inches of engine displacement (CID), (3) 
              type of transmission (manual or automatic), (4) gasoline or diesel 
              fuel, and (5) whether the vehicle's emissions control package met 
              Federal or California standards. Each record of the Certification 
              Files also contained the number of vehicles sold for each unique 
              combination of attributes. The vehicle attributes needed to assign 
              a test MPG for sample vehicles were obtained from the Vehicle Identification 
              Number (VIN), and/or from the RTECS questionnaire responses when 
              the VIN was unavailable. The VIN was decoded to yield the vehicle 
              attributes, by use of the Highway Loss Data Institute's "Vindicator" 
              software.
            In 
              addition to assigning test MPG, the EPA Certification Files were 
              used to impute for missing vehicle attributes. Based on the nonmissing 
              vehicle attributes obtained from the questionnaire and VIN, several 
              records from the EPA Certification Files were usually found as potential 
              "matches" to a given sample vehicle. A matching record 
              was chosen from among the several applicable ones, with probability 
              proportional to sales, using the sales figures on the EPA Certification 
              Files. Once chosen, a record provided EPA test MPG (city and highway), 
              as well as any vehicle attributes that were missing.
            The 
              1994 RTECS used a sequential adjustment procedure where the EPA 
              Composite MPG was adjusted first to an on-road MPG, and then to 
              an in-use MPG.
            **The 
              EPA Composite MPG**
            Beginning 
              in the early 1970's, EPA measured fuel efficiency from tests that 
              were conducted on a dynamometer to simulate actual driving conditions. 
              By 1975, EPA had incorporated separate "city" and "highway" 
              driving cycles into the test. The city and highway MPG were combined 
              to form a "composite" MPG, that was then weighted according 
              to sales of the production vehicles in order to assess compliance 
              with Corporate Average Fuel Economy (CAFE) standards. The EPA Composite 
              MPG is based on the assumption of a "typical" vehicle-use 
              pattern of 55 percent city driving and 45 percent highway driving, 
              and has become a convenient single fuel efficiency measure for analytical 
              and regulatory purposes.
            The 
              EPA Composite MPG is defined as:
            
            where:
            MPG(EPA 
              55/45) = the composite MPG
            MPG(EPA 
              city) = the fuel efficiency when vehicle use pattern is city 
              driving only
            MPG(EPA 
              highway) = the fuel efficiency when vehicle use pattern is 
              highway driving only.
            **Fuel 
              Efficiency Shortfall**
            Fuel 
              efficiency shortfall occurs when the fuel efficiency that is actually 
              obtained while using the vehicle is lower than the EPA test results. 
              Reasons for this shortfall are (1) a result of the differences between 
              EPA test vehicles and the vehicles actually in use and (2) the differences 
              between EPA procedures for simulated driving conditions and actual 
              driving conditions. For example, EPA test vehicles are prototypes 
              that do not contain the wide variety of power-consuming accessories 
              often found on vehicles sold to consumers. The test procedures also 
              do not simulate the actual driving conditions that affect fuel efficiency 
              such as speed and acceleration of individual drivers, road conditions, 
              weather, and traffic. In the 1994 RTECS, adjustments for this fuel 
              efficiency shortfall were made to the composite MPG (MPG(EPA 
              55/45)) that were assigned to the sample vehicles.
            Fuel 
              efficiency shortfall was expressed in terms of the "Gallons 
              per Mile Ratio" or GPMR:
            
            Where:
            GPMRi 
              = Gallons per Mile Ratio for vehicle i
            MPGi 
              = On-road MPG or in-use MPG for vehicle i, depending on the analysis
            MPG(EPA 
              55/45) = EPA Composite MPG applicable to vehicle i.
            If 
              GPMRi = 1 then there is no shortfall. If GPMRi 
              > 1 then there is a shortfall for vehicle i (That is, the on-road 
              or in-use fuel efficiency is less than the fuel efficiency indicated 
              by the EPA Composite MPG.) Note that GPMRi can represent 
              shortfall with respect to either the on-road or in-use MPGi, 
              depending on the analysis being performed. GPMRi is commonly 
              chosen as a measure of shortfall as opposed to MPGi for 
              the following reasons:
            A 
              shortfall adjustment is most often thought of as a correction factor,
              or multiplicative constant, rather than as an additive correction. 
              GPMRi satisfies this convention.
            Shortfall 
              is usually dependent on a vehicle's fuel efficiency level. That 
              is, shortfall is usually higher at high levels of MPG(EPA 55/45) 
              than at low levels of MPG(EPA 55/45). Therefore, it is 
              more informative to express the amount of shortfall relative to 
              MPG(EPA 55/45) rather than as an absolute quantity.
            GPMRi 
              is a linear function of MPG(EPA 55/45) and can be modeled 
              using ordinary least squares linear regression.
            GPMRi 
              is a transformation that stabilizes error variances for the purposes 
              of least squares linear regression.
            **The 
              On-Road MPG**
            On-road 
              MPG is a composite MPG that was adjusted to account for the shortfall 
              between the EPA fuel efficiency and the actual fuel efficiency obtained 
              on the road.
            The 
              EPA developed two general procedures for adjusting MPG(EPA 
              55/45) to an on-road value. One procedure bases the size of 
              the adjustment on specific technology features of the vehicle. The 
              other procedure uses just two MPG discount factors, one to adjust 
              the EPA highway estimate, the other to adjust the city estimate. 
              These two factors are used for all vehicles, regardless of technology 
              class. Either of these procedures could be used to adjust MPG(EPA 
              55/45) to an on-road MPG value for use in the 1994 RTECS. 
              Since both procedures were unbiased for trucks, the choice as to 
              which to employ in the 1994 RTECS should be based on their performance 
              with cars. The adjustment based on discount factors seemed to be 
              less biased than the Technology-Specific Adjustment. The discount 
              factors are also less expensive since they do not require collection 
              or imputation of information on fuel delivery system and drive-train. 
              Because of these reasons the Discount Factors Adjustment Method 
              was selected.
            **Shortfall 
              Adjustment Based on Discount Factors**
            EPA's 
              discount factors have widespread appeal because of their simplicity 
              (Hellman and Murrell, 1985[4]; Hellman and Murrell, 1984[5]). The 
              factors are .10 percent for city MPG and .22 percent for highway 
              MPG. That is, for any vehicle i,
            
            These 
              discount factors are the ones used to produce the "sticker" 
              MPG figures seen on vehicles on dealer lots, and are used to produce 
              the DOE/EPA *Gas Mileage Guide*. The analysis behind the 
              development of these factors was performed on a conglomerate data 
              base with data from Ford Motor Company, General Motors, Chrysler 
              Corporation, DOE, and EPA. The data base contained approximately 
              38,000 vehicle records with model years from 1979 through 1981 with 
              some 1982 models included. The data base contained predominately 
              American-made vehicles, but also included foreign vehicles as well. 
              The technology mix was dominated by rear-wheel drive and carbureted 
              vehicles, but contained some vehicles with front-wheel drive or 
              fuel injection. Vehicle records contained make, model, year, vehicle 
              characteristics, the MPG as measured on the road, MPG(EPA city), 
              and MPG(EPA highway). The data base also
            included 
              the driver's perceptions of the proportion of their travel that 
              was mostly urban (so called "city fraction"), and their 
              average miles driven per day (AMPD).
            Fuel 
              economy shortfall is affected by the vehicle use pattern: city-driving 
              pattern is characterized by frequent starts and short trip lengths, 
              while highway-driving pattern is characterized by infrequent starts 
              and long trips. AMPD is a good surrogate variable for representing 
              these different driving patterns.
            The 
              city-driving pattern was characterized by AMPD from 5 to 22 miles 
              per day, while the highway-driving pattern was characterized by 
              AMPD's from 15 to 105 miles per day (Hellman and Murrell, 1984). 
              City fraction and AMPD were used to split the data into two sets, 
              one for development of the city discount factor, the other for development 
              of the highway factor. The "city" and "highway" 
              data sets were each stratified by vehicle technology classes. Linear 
              regression was performed within each stratum. GPMR was regressed 
              on city fraction, AMPD, MPG(EPA 55/45), odometer reading, 
              and average temperature. The fitted models were then weighted and 
              combined across vehicle technology strata, to produce a single "city" 
              shortfall model and a single "highway" shortfall model. 
              The weights were used to increase the influence of those models 
              that represented technology mixes expected to become more prominent 
              in the future (e.g., front-wheel drive and fuel-injected vehicles). 
              The discount factors were derived from the two weighted models set 
              at average or typical values of the independent variables.
            
            For 
              each RTECS vehicle, discounted city and highway on-road MPG were 
              computed and then combined to form an on-road 55/45 composite as 
              follows:
            
            A 
              shortfall ratio based on EPA discount factors was computed for each 
              RTECS vehicle as follows:
            
            **The 
              In-Use MPG**
            In-use 
              MPG are MPG that are adjusted for individual driving circumstances. 
              The on-road adjustments to MPG(EPA 55/45) discussed in 
              the previous sections were "general" in that they did 
              not take into account any effects on fuel economy that are due to 
              the driver's individual circumstances. They, instead, utilized general 
              attributes such as the technology features of the vehicle and average 
              driving conditions. Fuel economy shortfall estimates can be refined 
              for an individual vehicle by taking into account the following "in-use" 
              effects.
            Urban 
              versus rural driving pattern. That is, frequent starts and short 
              trips as opposed to infrequent starts and longer trips. As mentioned 
              in the previous section, a useful single variable for representing 
              this effect is AMPD. High AMPD's usually represent mileage accumulated 
              on the highway.
            Traffic 
              congestion, which increases with population density.
            Seasonal 
              temperature variations, especially for gasoline-carbureted vehicles.
            Humidity, 
              which together with temperature, affects air-conditioner use.
            Differences 
              among geographic areas of the country.
            Altitude.
            Wind.
            Road 
              gradient and road surface conditions.
            In 
              general, the first four items are considered the most significant 
              in-use influences (Crawford, 1983[1]). In the cited study, shortfall 
              variations as high as 25 percent or more occurred over the range 
              of typical AMPD. Shortfall was 16 percent higher in urban areas 
              than in completely uncongested areas, and was 12 percent higher 
              in suburban areas. Shortfall varied seasonally (i.e., monthly) by 
              7 percent in the South and by 13 percent in the North.
            Regression 
              models were developed (Crawford, 1983) for use in adjusting GPMRi(on-road) 
              to an in-use shortfall employing measurements of several in-use 
              effects as the independent variables.
            The 
              regressions yielded a shortfall adjustment that was an additive
              one, as follows:
            
            where:
            GPMRij(in-use)= 
              the in-use shortfall ratio estimated for vehicle i and month j (j 
              = 1...12), GPMRi(on-road) = the on-road shortfall ratio 
              estimated for vehicle i, from the above equations, and
            ij 
              = an adjustment calculated for vehicle i and month j, from a regression 
              model.
            
            One 
              regression model from the Crawford reference which is appropriate 
              for use in RTECS is as follows:
            
            Where:
            AMPDij 
              = Average Miles per Day for vehicle i and month j, typically 35.6 
              (i.e., 13,000 miles per year).
            NORTH 
              = 1 if the household is in the North.
            0 
              if the household is not in the North.
            SOUTH 
              = 1 if the household is in the South.
            0 
              if the household is not in the South.
            This 
              regression model was chosen because the independent variables that 
              are important in explaining shortfall were readily available from 
              the 1994 RTECS data. The model had two components. One component 
              involved AMPDij and represented the influence of individual 
              driving patterns for a given vehicle and month. The other component 
              represented the change in shortfall that occurred throughout the 
              seasons, due to the annual temperature cycle. The original regression 
              equation also contained a minor term which accounted for the influence 
              of air-conditioner use during hot, humid weather. This term was 
              dropped in the 1994 RTECS estimations because it involved the rather 
              complex computation of "Discomfort Index" from NOAA weather 
              records, and the slight additional precision was judged insufficient 
              to warrant the additional processing expense. Additional terms representing 
              geographic regional effects, and the natural logarithm of population 
              density (people per square mile, to represent the influence of traffic 
              congestion) were not considered because of the computational cost.
            Once 
              a GPMRij(in-use) was estimated it was used to estimate 
              the final in-use fuel economy for vehicle i and month j as follows:
            
            The 
              regression equation had separate seasonal components for the "North" 
              and "South," because the difference between the winter 
              shortfall and the summer shortfall was greater in the North than 
              in the South. This difference can be seen in the model parameters. 
              To define the North and South geographic areas the continental United 
              States were divided into 97 two-digit ZIP Code regions. These regions 
              were grouped to form two aggregate regions ("North" and 
              "South") according to average winter and summer temperatures, 
              and seasonal shortfall trends.
            **Annual 
              Vehicle Fuel Consumption**
            In 
              the 1994 RTECS, annual consumption was calculated by dividing the 
              annual VMT by the annual MPG. The following is a derivation of the 
              annual VMT and annual MPG.
            The 
              MPGij(in-use) shown in the above section about fuel efficiency 
              estimation procedures were final estimates of monthly in-use fuel 
              economies for vehicle i, and could have been used for estimating 
              monthly fuel consumptions and expenditures if monthly VMT were known. 
              However, RTECS collected only annual VMT, as calculated from the 
              B-O-Y and E-O-Y odometer readings. Nevertheless, the 1994 RTECS 
              still made use of the MPGij(in-use) by disaggregating 
              the annual VMT of sample vehicles into monthly VMT.
            The 
              annual consumption for vehicle i can be thought of as the sum of 
              the individual monthly consumptions:
            Where:
            Ci 
              = Annual consumption of vehicle fuel for vehicle i, in gallons
            spi 
              = Month starting possession of vehicle i by the household, or January 
              1994, whichever is later
            epi 
              = Month ending possession of vehicle i by the household, or December 
              1994, whichever is earlier
            
            cij 
              = Consumption of vehicle fuel for vehicle i, during month j.
            Consumption 
              is calculated over only those months that vehicle i was reported 
              to be owned or used by the household. In this sense, "annual" 
              does not necessarily mean a full 12 months. This is an important 
              point since fuel economy varies seasonally. If vehicle i was in 
              the household for the entire year, then spi = JAN and 
              epi = DEC.
            Consumption 
              for each month can be expressed in terms of monthly VMT and monthly 
              fuel economy:
            
            Where:
            mij 
              = VMT for vehicle i, month j
            mpgij 
              = Fuel economy in miles per gallon for vehicle i, month j
            so 
              that:
            
            In 
              the 1994 RTECS Ci was estimated by substituting the estimated 
              MPGij(in-use) for mpgij. The mij 
              was estimated in RTECS by disaggregating the annual VMT from odometer 
              readings into monthly VMT. The disaggregation was performed as follows:
            
            Where:
            Mi 
              = Annual VMT for vehicle i, calculated using odometer readings and 
              the two-step adjustment procedure
            discussed 
              in the section titled "Vehicle Miles Traveled"
            f(i,j) 
              = Average fraction of "annual" VMT that was driven during 
              month j, estimated for vehicle i
            There 
              is no single distribution of average monthly VMT fractions f(ij). 
              Rather, there was a family of distributions, the members of which 
              were determined by the particular months a vehicle was owned or 
              used by a household. According to this definition of monthly VMT 
              fractions, no matter which months vehicle i was in a household, 
              it was always true that:
            
            The 
              f(i,j) were derived from the Fj in Table B1
              as follows:
            
            Otherwise
            
            Substituting 
              mpgij = MPGij(in-use) and mij = 
              Mi x f(i,j) into Equation 13.
            yields 
              the following estimate of annual consumption for vehicle i:
            
            The 
              estimator of annual consumption in the above equation was constructed 
              with 1994 RTECS data.
            For 
              vehicles that were acquired or disposed of during 1994, the estimator 
              took into account seasonal differences in the overall fuel economy 
              and the effects of these differences on the overall fuel consumption.
            Substituting 
              MPG(EPA 55/45) in the above equation, and slightly rearranging 
              the terms, the estimator of consumption is:
            
            A 
              single "annualized" fuel economy that is analogous to 
              the "annualized" MPGi from previous RTECS, 
              was estimated as:
            
            Thus
            
            **Annual 
              Vehicle-Fuel Expenditures and Price**
            **Vehicle 
              Fuel Expenditures**
            In 
              the 1994 RTECS, fuel expenditures were calculated by multiplying 
              the vehicle-fuel consumption by the price of the vehicle fuel. The 
              1994 RTECS, like the 1988 and 1991 RTECS, did not collect vehicle 
              fuel prices via fuel purchase diaries. Instead, each RTECS vehicle 
              was assigned a price based on reported fuel type used in the vehicle. 
              Gasoline prices were obtained from the BLS 1994 Retail Gasoline 
              Pump Price Series. Diesel fuel prices were obtained from the Lundberg 
              Survey, Inc. (See "Other Fuel Types" in this appendix 
              for a discussion of the gasohol and propane prices.)
            Respondents 
              were asked if they purchased leaded or unleaded gasoline, and if 
              unleaded, they were asked the grade. (See Appendix D, "Survey 
              Forms.") The BLS prices are published by month, by Census region, 
              and by type and grade of fuel. In 1988, the BLS monthly prices (for 
              the Census region in which the household lived) were averaged across 
              the months that the vehicle was in the possession of the household. 
              This yielded for each RTECS vehicle a single fuel price, Pi, 
              dependent on the Census region, type and grade of gasoline, and 
              the months that the vehicle was in the possession of the household. 
              In 1988, the annual fuel expenditures in dollars for each sample 
              vehicle, Ei, was estimated by multiplying its assigned 
              average fuel price, Pi, by its total consumption in gallons, 
              Ci, as estimated in the previous section. However, in 
              1994, annual fuel expenditures, Ei, was estimated by 
              multiplying monthly gasoline prices by monthly consumption to produce 
              monthly expenditures and summing the monthly expenditures to produce 
              annual expenditures.
            **Type 
              of Fuel Used**
            Table
              B2 provides the percentage distribution of RTECS vehicles by fuel 
              type categories. In 1994, 97.9 percent of the 156.8 million RTECS 
              vehicles used unleaded gasoline. The remaining 6.3 percent of vehicles 
              used leaded gasoline, diesel fuel or other fuel types.
            **Table
            B2. Distribution of Residential Transportation nergy Consumption Survey 
            Vehicles by Type** **of Fuel Used, 1994** 
            Type 
                    of Vehicle Fuel
                Number 
                  of Vehicles millions)
                Percent 
                    of Vehicles**Total**
                156.8
                100.0**Gasoline** Leaded
                  Unleaded
                  Regular
                  Premium
                  Intermediate
                153.4
                  Q 
                  151.5 
                  14.2 
                  26.7 
                  20.6
                97.9 
                  
                  Q 
                  96.7 
                  66.4 
                  17.1
                  13.2**Diesel**
                1.8
                1.1**Gasohol**
                1.4
                0.9Notes: 
              Because of rounding, data may not sum to totals. For a discussion 
              of underreporting of gasohol see Appendix C,
            "Quality 
              of the Data."
            Q 
              = Data withheld either because the Relative Standard Error (RSE) 
              was greater than 50 percent or fewer than 10 households were sampled.
            Source: 
              Energy Information Administration, Office of Energy Markets and 
              End Use, 1994 Residential Transportation
            Energy 
              Consumption Survey.
            **Gasoline 
              Prices**
            Prices 
              published by the BLS survey are retail prices for leaded regular, 
              unleaded regular, and unleaded premium gasoline. These prices are 
              published monthly by Census region. The BLS Pump Price Survey is 
              conducted as input to the *Consumer Price Index (CPI)*. Prices 
              are collected in 85 urban areas. The population covered excludes 
              the institutional population and households located on military 
              bases. The covered population includes approximately 85 percent 
              of all U.S. households. The BLS uses a rotating sample of approximately 
              1,100 service stations.
            Each 
              vehicle in the 1994 RTECS, that used gasoline was assigned a monthly 
              BLS fuel price. The BLS "unleaded regular" price was assigned 
              to all vehicles that reported using leaded gasoline..
            **Diesel 
              Fuel Prices**
            Diesel 
              fuel prices were obtained from the "Lundberg Letter-PS" 
              published by Lundberg Survey, Inc. The Lundberg Survey, Inc. collects 
              pump prices at retail service stations in approximately 80 major 
              metropolitan markets. The survey includes about 15,000 service stations 
              divided into 2 bimonthly panels. At least one city from every State 
              is included. Service stations on military bases and in rural areas 
              are excluded. Sales-weighted price data for both full-and self-service 
              stations are published bimonthly. Regional prices are not published. 
              All RTECS vehicles that used diesel fuel were assigned the same 
              diesel fuel prices regardless of Census region.
            For 
              the RTECS, the following two steps were used to create diesel prices. 
              (1) Bimonthly diesel fuel full-service and self-service prices, 
              obtained from the Lundberg Letter-PS, were averaged to create prices 
              for each grade in the intermediate months. (2) The monthly full- 
              and self-service prices were then weighted and averaged to obtain 
              overall diesel fuel prices. The weights used to create an average 
              diesel fuel price from the full- and self-service prices were based 
              on RTECS data on "type of service" (full-service or self-/mini-service) 
              used when purchasing diesel fuel. For each vehicle monthly prices 
              were multiplied by monthly consumption to yield monthly expenditures. 
              The monthly expenditures were summed to produce annual expenditures.
            Other 
              Fuel Type Prices
            Approximately 
              1.4 million 1994 RTECS vehicles were reported using gasohol. In 
              the absence of applicable national estimates of the average price 
              paid for gasohol, the RTECS vehicles using gasohol were assigned 
              fuel prices using the same methodology as the most common group 
              of vehicles in the survey--vehicles using regular unleaded gasoline. 
              (See above for methodology assigning unleaded regular gasoline prices 
              and Appendix C, "Quality of the Data" for a discussion 
              of RTECS underestimation of other fuels.)
            **References**
            1. 
              Crawford, R. 1983. *"Seasonal and Regional MPG as Influenced 
              by Environmental Conditions and Travel Patterns."* Research 
              performed under contract for DOE. Energy and Environmental Analysis, 
              Inc., Arlington, VA.
            2. 
              Harrison, I.M. *"Retail Fuel Pump-Prices,"* Residential 
              Transportation Energy Consumption Survey Technical Note 4, unpublished 
              document. (Washington, DC, 1994).
            3. 
              Harrison, I.M. *"VMT 1994 Patterns,"* Residential 
              Transportation Energy Consumption Survey Technical Note 5, unpublished 
              document. (Washington, DC, 1994).
            4. 
              Hellman, K.H., and Murrell, J.D. 1985. *"On the Stability 
              of the EPA MPG Adjustment Factors."* Society of Automotive 
              Engineers Technical Paper Series, SAE Paper No. 851216, Warrendale, 
              PA.
            5. 
              Hellman, K.H., and Murrell, J.D. 1984. *"Development of 
              Adjustment Factors for the EPA City and Highway MPG Values."* 
              Society of Automotive Engineers Technical Paper Series, SAE Paper 
              No. 840496, Warrendale, PA.
            6. 
              Lax, D. 1987. *"Feasibility of Estimating In-Use Vehicle 
              Fuel Efficiency from Household Survey Data."* Research 
              performed under contract for ORNL/DOE/EIA. Energy and Environmental 
              Analysis Inc., Arlington, VA.
            7. 
              *"Lundberg Letter-PS,"* Lundberg Survey Inc. 1994. 
              (North Hollywood, CA).
            8. 
              U.S. Department of Energy and U.S. Environmental Protection Agency, 
              *Gas Mileage Guide, EPA Fuel Economy Estimates*. (Washington, 
              DC).
            9. 
              *"Average Prices for Gasoline, U.S. City Average and Selected 
              Areas,"*U.S. Department of Labor, Bureau of Labor Statistics, 
              1994. (Washington, DC).
            
            File Last Modified: August 25, 1997
            If you are having any technical problems with this 
            site, please contact the EIA Webmaster at wmaster@eia.doe.gov | **Appendix B**
      **Estimation Methodologies**
      **Introduction**
            Statistics 
              concerning vehicle miles traveled (VMT), vehicle fuel efficiency 
              (given in terms of miles per gallon (MPG)), vehicle fuel consumption, 
              and vehicle fuel expenditures are presented in this report. The 
              methodology used to estimate these statistics relied on data from 
              the 1993 Residential Energy Consumption Survey (RECS), the 1994 
              Residential Transportation Energy Consumption Survey (RTECS), the 
              U.S. Environmental Protection Agency (EPA) fuel efficiency test 
              results, the U.S. Bureau of Labor Statistics (BLS) retail pump price 
              series, and the Lundberg Survey, Inc., price series for 1994.
            The 
              estimation of these four statistics (VMT, vehicle fuel efficiency, 
              vehicle fuel consumption, and vehicle fuel expenditures) occurred 
              in several steps (Figure B1). First, for each RTECS vehicle, the 
              VMT were determined from two actual odometer readings or imputed 
              using data from the 1993 RECS. Second, the annual on-road fuel efficiency, 
              given in terms of MPG, was estimated using the questionnaire responses, 
              decoded Vehicle Identification Number (VIN) data, EPA fuel efficiency 
              test results, and the months that the vehicle was in use. The MPG 
              were adjusted to account for the difference between EPA test values 
              and on-road values. Third, estimated vehicle fuel consumption was 
              derived by dividing the VMT by the estimated MPG. Finally, the estimated 
              vehicle fuel expenditures were derived by multiplying the vehicle 
              fuel consumption by the fuel price. The 1994 RTECS, like the 1988 
              RTECS, did not collect vehicle fuel prices via fuel purchase diaries. 
              Instead each RTECS vehicle was assigned a price based on reported 
              fuel type used in each vehicle. Gasoline prices were obtained from 
              the BLS 1994 Retail Gasoline Pump Price Series. Diesel fuel prices 
              were obtained from the Lundberg Survey, Inc. (See "Other Fuel 
              Types" in this appendix for a discussion of the gasohol and 
              propane prices.)
            The 
              following sections of this appendix describe the estimation procedures 
              used for calculating the VMT, the MPG, the vehicle fuel consumption, 
              the vehicle fuel prices, and the vehicle fuel expenditures. Also 
              described in this appendix are the sources of data that were used 
              in the estimation procedures.
            The 
              following terms are used throughout this appendix:
            **Terms**
                **Definitions**EPA 
                  Composite MPG
                The 
                  EPA dynamometer test procedure, performed on preproduction prototype 
                  vehicles, yields separate test values for EPA city and highway 
                  MPG. These city and highway MPG are often combined to form the 
                  "composite" MPG.On-Road 
                  MPG
                A 
                  composite MPG that was adjusted to account for the shortfall 
                  between the test value and the fuel efficiency actually obtained 
                  on the road. The adjustment did not take into account the driving 
                  patterns of individual drivers and seasonal differences.In-Use 
                  MPG
                MPG 
                  that were adjusted for seasonal differences and annual miles 
                  driven. Vehicles that are driven relatively few miles during 
                  the year are assumed to be driven mostly on short trips that 
                  involve frequent stops. Vehicles that are driven relatively 
                  many miles are assumed to be driven mostly on long trips where 
                  few stops are needed.MPG 
                  Shortfall
                A 
                  measure of the difference between actual on-road MPG and the 
                  EPA laboratory test MPG. Expressed as the ratio of test MPG 
                  to on-road MPG.**Vehicle 
              Miles Traveled**
            When 
              possible, VMT were determined for a sample vehicle by taking the 
              difference between two odometer readings, which spanned a period 
              of time. This method was used to determine VMT for 2,648 (48 percent) 
              of the 5,553 RTECS sample vehicles. Attempts were made to obtain 
              odometer readings during the RECS interviews, the End-of-Year (E-O-Y) 
              RTECS interview and any time a vehicle was acquired or disposed. 
              A "span" of odometer readings was the difference between 
              two odometer readings. In most cases, this span was a B-O-Y to E-O-Y 
              span, although due to an occasional nonresponse, only shorter spans 
              were obtained, such as RECS to B-O-Y. Odometer spans of less than 
              a full year were also obtained for vehicles that were either acquired 
              or disposed of during the survey year.
            The 
              VMT that were assigned to each RTECS vehicle corresponded to the 
              period of time that the vehicle was in possession by the sample 
              household. In most cases, however, this period of possession did 
              not correspond exactly with the beginning and ending dates for the 
              odometer span. This was true even for vehicles with a complete B-O-Y 
              to E-O-Y odometer span; because odometer cards were mailed to respondents 
              in several distinct waves at the beginning and end of the RTECS 
              survey; and because the exact dates of odometer readings were often 
              left to the convenience of the respondents. Therefore, all VMT obtained 
              from odometer spans were adjusted to correspond to the period of 
              time that the vehicle was in possession by the sample household. 
              A 2-step adjustment procedure was used. STEP 1 adjusted the odometer-span 
              VMT to a standard annualized mileage covering 365 days, and STEP 
              2 readjusted the annualized VMT to correspond to the exact period 
              of time that the vehicle was in possession by the household. These 
              adjustments took into account a typical distribution of VMT fractions 
              among the different months of the year. Step 2 was performed only 
              for vehicles that were not in the possession of the household for 
              the entire calendar year 1994.
            **STEP 
              1:**
            This 
              step adjusted the odometer-span VMT to a standard annualized VMT 
              covering a full year, regardless of whether the span of odometer 
              readings covered approximately 1 year or only a short span of time. 
              Annualized VMT for vehicle i were computed as:
            
            Where: Fj 
              = Monthly VMT fractions from the standard distribution in Table
              B1 soi 
              = Month of starting odometer readings for vehicle i 
              eoi 
              = Month of ending odometer readings for vehicle i. 
              The 
              starting and ending Fj were prorated according to the 
              exact day of the month for the odometer readings. For example, if 
              a final odometer reading was taken on September 15, then (14/30) 
              x FSEP was used.
            **Table
              B1.Distribution of Average Monthly Vehicle Miles Traveled Fractions**
            Month 
                    j
                Average 
                    VMT per Vehicle
                FjJanuary
                688
                0.0728February
                697
                0.0738March
                771
                0.0816April
                783
                0.0829May
                832
                0.0880June
                847
                0.0896July
                868
                0.0919August
                872
                0.0923September
                800
                0.0847October
                802
                0.0849November
                756
                0.0800December
                734
                0.0777Total
                9,450
                1.0000Source: 
              1984 Petroleum Marketing Index (PMI) Survey, NPD Research Inc. The 
              survey is a demographically and geographically balanced-quota sample 
              of 4,100 households. Respondents maintained fuel purchase diaries 
              for an average of 10 months. As part of the survey, information 
              was collected on the characteristics of trips taken in vehicles 
              during a designated day. Trip lengths were recorded as respondent 
              perception rather than from odometer readings. The distribution 
              of monthly mileage fractions has been obtained from this survey.
            **STEP 
              2:**
            Once 
              an annualized VMT was obtained from STEP 1 as described earlier, 
              it was adjusted to correspond to the time period that vehicle i 
              was in possession by the sample household as:
            
            Where:
            Fj 
              = Monthly VMT fractions from the standard distribution in Table
              B1
            spi 
              = Month starting possession of vehicle i by the household, or January 
              1994, whichever is later
            epi 
              = Month ending possession of vehicle i by the household, or December 
              1994, whichever is earlier.
            If 
              vehicle i was in the household for the entire year then spi 
              = JAN and epi = DEC. If a vehicle was acquired or disposed 
              of during the survey, the starting or ending Fj was prorated 
              according to the appropriate day of the month.
            To 
              ensure that the distribution of average monthly vehicle miles traveled 
              fractions given in Table B1 reflected 1994 driving patterns, a study
              of Federal Highway Administration (FHWA) Traffic Volume data for 
              1994 was conducted. This study resulted in FHWA VMT fractions being 
              constructed for 1984 and 1993. FHWA 1993 data were used since the 
              1994 data for the entire year was unavailable. Annual VMT calculations 
              were completed using both the NPD and FHWA fractions. The differences 
              in average annual VMT per vehicle between using the NPD and FHWA 
              VMT fractions ranged between 1 and 18 miles and were less than the 
              standard errors of the average annual VMT. Therefore, in 1994 the 
              NPD VMT fractions given in Table B1 will be used to compute annualized
              VMT since the differences in annual VMT between using the NPD and 
              FHWA fractions were minor (RTECS Technote 5[3]).
            **Incomplete 
              Odometer or VMT Data**
            For 
              1,927 sample vehicles (35 percent), no odometer span was available, 
              although an estimate of annual VMT had been obtained from the respondent 
              during the RECS interview. VMT for these vehicles were imputed from 
              a regression on the estimated VMT obtained from the RECS. For another 
              978 sample vehicles (17 percent), no odometer span was available 
              and a VMT estimate was not obtained during the RECS interview. VMT 
              for these vehicles were imputed using a multiple linear regression 
              model, where the independent variables were number of drivers, household 
              income, age of household head, type of vehicle, and use of vehicle 
              on the job. This regression was also used for imputing VMT for vehicles 
              that were imputed as being acquired or disposed. Both of the regression 
              models described above yielded estimates of annualized VMT. The 
              STEP 2 adjustment described previously was then used to adjust this 
              VMT to correspond with the time the vehicle was in the possession 
              of the household.
            **Vehicle 
              Fuel Efficiency**
            Fuel 
              efficiency (MPG) must be estimated for each RTECS sample vehicle 
              in order to estimate each vehicle's fuel consumption for the survey 
              year. (Fuel consumption is estimated by dividing the VMT for time 
              of possession, by the MPG.) Prior to 1988, the RTECS obtained actual 
              fuel consumption data and on-road MPG from fuel purchase diaries 
              maintained by the respondents. However, no fuel purchase diaries 
              were used in the 1988 thru 1994 RTECS. Instead, the 1994 MPG were 
              estimated using EPA laboratory test MPG that were adjusted to account 
              for differences between actual on-road MPG and the EPA test MPG. 
              This difference is known as MPG "shortfall." The feasibility 
              of using shortfall-adjusted MPG in an RTECS survey was investigated 
              by Lax, 1987[6]. That study verified that the method yielded unbiased 
              MPG, when using a data base from a 1984 fuel purchase diary study 
              performed by NPD Research, Inc. The adequacy of current shortfall 
              adjustment methods is sufficient for late 1980 through early 1993's 
              motor vehicle model years also (RTECS Technote 5[3]).
                    The 
              RTECS sample vehicles were assigned EPA test MPG from the EPA Emissions 
              Certification Files. Each record of the Certification Files contained 
              EPA test MPG for each unique combination of vehicle attributes within 
              a given make, model, and year. These attributes were (1) number 
              of cylinders, (2) cubic inches of engine displacement (CID), (3) 
              type of transmission (manual or automatic), (4) gasoline or diesel 
              fuel, and (5) whether the vehicle's emissions control package met 
              Federal or California standards. Each record of the Certification 
              Files also contained the number of vehicles sold for each unique 
              combination of attributes. The vehicle attributes needed to assign 
              a test MPG for sample vehicles were obtained from the Vehicle Identification 
              Number (VIN), and/or from the RTECS questionnaire responses when 
              the VIN was unavailable. The VIN was decoded to yield the vehicle 
              attributes, by use of the Highway Loss Data Institute's "Vindicator" 
              software.
            In 
              addition to assigning test MPG, the EPA Certification Files were 
              used to impute for missing vehicle attributes. Based on the nonmissing 
              vehicle attributes obtained from the questionnaire and VIN, several 
              records from the EPA Certification Files were usually found as potential 
              "matches" to a given sample vehicle. A matching record 
              was chosen from among the several applicable ones, with probability 
              proportional to sales, using the sales figures on the EPA Certification 
              Files. Once chosen, a record provided EPA test MPG (city and highway), 
              as well as any vehicle attributes that were missing.
            The 
              1994 RTECS used a sequential adjustment procedure where the EPA 
              Composite MPG was adjusted first to an on-road MPG, and then to 
              an in-use MPG.
            **The 
              EPA Composite MPG**
            Beginning 
              in the early 1970's, EPA measured fuel efficiency from tests that 
              were conducted on a dynamometer to simulate actual driving conditions. 
              By 1975, EPA had incorporated separate "city" and "highway" 
              driving cycles into the test. The city and highway MPG were combined 
              to form a "composite" MPG, that was then weighted according 
              to sales of the production vehicles in order to assess compliance 
              with Corporate Average Fuel Economy (CAFE) standards. The EPA Composite 
              MPG is based on the assumption of a "typical" vehicle-use 
              pattern of 55 percent city driving and 45 percent highway driving, 
              and has become a convenient single fuel efficiency measure for analytical 
              and regulatory purposes.
            The 
              EPA Composite MPG is defined as:
            
            where:
            MPG(EPA 
              55/45) = the composite MPG
            MPG(EPA 
              city) = the fuel efficiency when vehicle use pattern is city 
              driving only
            MPG(EPA 
              highway) = the fuel efficiency when vehicle use pattern is 
              highway driving only.
            **Fuel 
              Efficiency Shortfall**
            Fuel 
              efficiency shortfall occurs when the fuel efficiency that is actually 
              obtained while using the vehicle is lower than the EPA test results. 
              Reasons for this shortfall are (1) a result of the differences between 
              EPA test vehicles and the vehicles actually in use and (2) the differences 
              between EPA procedures for simulated driving conditions and actual 
              driving conditions. For example, EPA test vehicles are prototypes 
              that do not contain the wide variety of power-consuming accessories 
              often found on vehicles sold to consumers. The test procedures also 
              do not simulate the actual driving conditions that affect fuel efficiency 
              such as speed and acceleration of individual drivers, road conditions, 
              weather, and traffic. In the 1994 RTECS, adjustments for this fuel 
              efficiency shortfall were made to the composite MPG (MPG(EPA 
              55/45)) that were assigned to the sample vehicles.
            Fuel 
              efficiency shortfall was expressed in terms of the "Gallons 
              per Mile Ratio" or GPMR:
            
            Where:
            GPMRi 
              = Gallons per Mile Ratio for vehicle i
            MPGi 
              = On-road MPG or in-use MPG for vehicle i, depending on the analysis
            MPG(EPA 
              55/45) = EPA Composite MPG applicable to vehicle i.
            If 
              GPMRi = 1 then there is no shortfall. If GPMRi 
              > 1 then there is a shortfall for vehicle i (That is, the on-road 
              or in-use fuel efficiency is less than the fuel efficiency indicated 
              by the EPA Composite MPG.) Note that GPMRi can represent 
              shortfall with respect to either the on-road or in-use MPGi, 
              depending on the analysis being performed. GPMRi is commonly 
              chosen as a measure of shortfall as opposed to MPGi for 
              the following reasons:
            A 
              shortfall adjustment is most often thought of as a correction factor,
              or multiplicative constant, rather than as an additive correction. 
              GPMRi satisfies this convention.
            Shortfall 
              is usually dependent on a vehicle's fuel efficiency level. That 
              is, shortfall is usually higher at high levels of MPG(EPA 55/45) 
              than at low levels of MPG(EPA 55/45). Therefore, it is 
              more informative to express the amount of shortfall relative to 
              MPG(EPA 55/45) rather than as an absolute quantity.
            GPMRi 
              is a linear function of MPG(EPA 55/45) and can be modeled 
              using ordinary least squares linear regression.
            GPMRi 
              is a transformation that stabilizes error variances for the purposes 
              of least squares linear regression.
            **The 
              On-Road MPG**
            On-road 
              MPG is a composite MPG that was adjusted to account for the shortfall 
              between the EPA fuel efficiency and the actual fuel efficiency obtained 
              on the road.
            The 
              EPA developed two general procedures for adjusting MPG(EPA 
              55/45) to an on-road value. One procedure bases the size of 
              the adjustment on specific technology features of the vehicle. The 
              other procedure uses just two MPG discount factors, one to adjust 
              the EPA highway estimate, the other to adjust the city estimate. 
              These two factors are used for all vehicles, regardless of technology 
              class. Either of these procedures could be used to adjust MPG(EPA 
              55/45) to an on-road MPG value for use in the 1994 RTECS. 
              Since both procedures were unbiased for trucks, the choice as to 
              which to employ in the 1994 RTECS should be based on their performance 
              with cars. The adjustment based on discount factors seemed to be 
              less biased than the Technology-Specific Adjustment. The discount 
              factors are also less expensive since they do not require collection 
              or imputation of information on fuel delivery system and drive-train. 
              Because of these reasons the Discount Factors Adjustment Method 
              was selected.
            **Shortfall 
              Adjustment Based on Discount Factors**
            EPA's 
              discount factors have widespread appeal because of their simplicity 
              (Hellman and Murrell, 1985[4]; Hellman and Murrell, 1984[5]). The 
              factors are .10 percent for city MPG and .22 percent for highway 
              MPG. That is, for any vehicle i,
            
            These 
              discount factors are the ones used to produce the "sticker" 
              MPG figures seen on vehicles on dealer lots, and are used to produce 
              the DOE/EPA *Gas Mileage Guide*. The analysis behind the 
              development of these factors was performed on a conglomerate data 
              base with data from Ford Motor Company, General Motors, Chrysler 
              Corporation, DOE, and EPA. The data base contained approximately 
              38,000 vehicle records with model years from 1979 through 1981 with 
              some 1982 models included. The data base contained predominately 
              American-made vehicles, but also included foreign vehicles as well. 
              The technology mix was dominated by rear-wheel drive and carbureted 
              vehicles, but contained some vehicles with front-wheel drive or 
              fuel injection. Vehicle records contained make, model, year, vehicle 
              characteristics, the MPG as measured on the road, MPG(EPA city), 
              and MPG(EPA highway). The data base also
            included 
              the driver's perceptions of the proportion of their travel that 
              was mostly urban (so called "city fraction"), and their 
              average miles driven per day (AMPD).
            Fuel 
              economy shortfall is affected by the vehicle use pattern: city-driving 
              pattern is characterized by frequent starts and short trip lengths, 
              while highway-driving pattern is characterized by infrequent starts 
              and long trips. AMPD is a good surrogate variable for representing 
              these different driving patterns.
            The 
              city-driving pattern was characterized by AMPD from 5 to 22 miles 
              per day, while the highway-driving pattern was characterized by 
              AMPD's from 15 to 105 miles per day (Hellman and Murrell, 1984). 
              City fraction and AMPD were used to split the data into two sets, 
              one for development of the city discount factor, the other for development 
              of the highway factor. The "city" and "highway" 
              data sets were each stratified by vehicle technology classes. Linear 
              regression was performed within each stratum. GPMR was regressed 
              on city fraction, AMPD, MPG(EPA 55/45), odometer reading, 
              and average temperature. The fitted models were then weighted and 
              combined across vehicle technology strata, to produce a single "city" 
              shortfall model and a single "highway" shortfall model. 
              The weights were used to increase the influence of those models 
              that represented technology mixes expected to become more prominent 
              in the future (e.g., front-wheel drive and fuel-injected vehicles). 
              The discount factors were derived from the two weighted models set 
              at average or typical values of the independent variables.
            
            For 
              each RTECS vehicle, discounted city and highway on-road MPG were 
              computed and then combined to form an on-road 55/45 composite as 
              follows:
            
            A 
              shortfall ratio based on EPA discount factors was computed for each 
              RTECS vehicle as follows:
            
            **The 
              In-Use MPG**
            In-use 
              MPG are MPG that are adjusted for individual driving circumstances. 
              The on-road adjustments to MPG(EPA 55/45) discussed in 
              the previous sections were "general" in that they did 
              not take into account any effects on fuel economy that are due to 
              the driver's individual circumstances. They, instead, utilized general 
              attributes such as the technology features of the vehicle and average 
              driving conditions. Fuel economy shortfall estimates can be refined 
              for an individual vehicle by taking into account the following "in-use" 
              effects.
            Urban 
              versus rural driving pattern. That is, frequent starts and short 
              trips as opposed to infrequent starts and longer trips. As mentioned 
              in the previous section, a useful single variable for representing 
              this effect is AMPD. High AMPD's usually represent mileage accumulated 
              on the highway.
            Traffic 
              congestion, which increases with population density.
            Seasonal 
              temperature variations, especially for gasoline-carbureted vehicles.
            Humidity, 
              which together with temperature, affects air-conditioner use.
            Differences 
              among geographic areas of the country.
            Altitude.
            Wind.
            Road 
              gradient and road surface conditions.
            In 
              general, the first four items are considered the most significant 
              in-use influences (Crawford, 1983[1]). In the cited study, shortfall 
              variations as high as 25 percent or more occurred over the range 
              of typical AMPD. Shortfall was 16 percent higher in urban areas 
              than in completely uncongested areas, and was 12 percent higher 
              in suburban areas. Shortfall varied seasonally (i.e., monthly) by 
              7 percent in the South and by 13 percent in the North.
            Regression 
              models were developed (Crawford, 1983) for use in adjusting GPMRi(on-road) 
              to an in-use shortfall employing measurements of several in-use 
              effects as the independent variables.
            The 
              regressions yielded a shortfall adjustment that was an additive
              one, as follows:
            
            where:
            GPMRij(in-use)= 
              the in-use shortfall ratio estimated for vehicle i and month j (j 
              = 1...12), GPMRi(on-road) = the on-road shortfall ratio 
              estimated for vehicle i, from the above equations, and
            ij 
              = an adjustment calculated for vehicle i and month j, from a regression 
              model.
            
            One 
              regression model from the Crawford reference which is appropriate 
              for use in RTECS is as follows:
            
            Where:
            AMPDij 
              = Average Miles per Day for vehicle i and month j, typically 35.6 
              (i.e., 13,000 miles per year).
            NORTH 
              = 1 if the household is in the North.
            0 
              if the household is not in the North.
            SOUTH 
              = 1 if the household is in the South.
            0 
              if the household is not in the South.
            This 
              regression model was chosen because the independent variables that 
              are important in explaining shortfall were readily available from 
              the 1994 RTECS data. The model had two components. One component 
              involved AMPDij and represented the influence of individual 
              driving patterns for a given vehicle and month. The other component 
              represented the change in shortfall that occurred throughout the 
              seasons, due to the annual temperature cycle. The original regression 
              equation also contained a minor term which accounted for the influence 
              of air-conditioner use during hot, humid weather. This term was 
              dropped in the 1994 RTECS estimations because it involved the rather 
              complex computation of "Discomfort Index" from NOAA weather 
              records, and the slight additional precision was judged insufficient 
              to warrant the additional processing expense. Additional terms representing 
              geographic regional effects, and the natural logarithm of population 
              density (people per square mile, to represent the influence of traffic 
              congestion) were not considered because of the computational cost.
            Once 
              a GPMRij(in-use) was estimated it was used to estimate 
              the final in-use fuel economy for vehicle i and month j as follows:
            
            The 
              regression equation had separate seasonal components for the "North" 
              and "South," because the difference between the winter 
              shortfall and the summer shortfall was greater in the North than 
              in the South. This difference can be seen in the model parameters. 
              To define the North and South geographic areas the continental United 
              States were divided into 97 two-digit ZIP Code regions. These regions 
              were grouped to form two aggregate regions ("North" and 
              "South") according to average winter and summer temperatures, 
              and seasonal shortfall trends.
            **Annual 
              Vehicle Fuel Consumption**
            In 
              the 1994 RTECS, annual consumption was calculated by dividing the 
              annual VMT by the annual MPG. The following is a derivation of the 
              annual VMT and annual MPG.
            The 
              MPGij(in-use) shown in the above section about fuel efficiency 
              estimation procedures were final estimates of monthly in-use fuel 
              economies for vehicle i, and could have been used for estimating 
              monthly fuel consumptions and expenditures if monthly VMT were known. 
              However, RTECS collected only annual VMT, as calculated from the 
              B-O-Y and E-O-Y odometer readings. Nevertheless, the 1994 RTECS 
              still made use of the MPGij(in-use) by disaggregating 
              the annual VMT of sample vehicles into monthly VMT.
            The 
              annual consumption for vehicle i can be thought of as the sum of 
              the individual monthly consumptions:
            Where:
            Ci 
              = Annual consumption of vehicle fuel for vehicle i, in gallons
            spi 
              = Month starting possession of vehicle i by the household, or January 
              1994, whichever is later
            epi 
              = Month ending possession of vehicle i by the household, or December 
              1994, whichever is earlier
            
            cij 
              = Consumption of vehicle fuel for vehicle i, during month j.
            Consumption 
              is calculated over only those months that vehicle i was reported 
              to be owned or used by the household. In this sense, "annual" 
              does not necessarily mean a full 12 months. This is an important 
              point since fuel economy varies seasonally. If vehicle i was in 
              the household for the entire year, then spi = JAN and 
              epi = DEC.
            Consumption 
              for each month can be expressed in terms of monthly VMT and monthly 
              fuel economy:
            
            Where:
            mij 
              = VMT for vehicle i, month j
            mpgij 
              = Fuel economy in miles per gallon for vehicle i, month j
            so 
              that:
            
            In 
              the 1994 RTECS Ci was estimated by substituting the estimated 
              MPGij(in-use) for mpgij. The mij 
              was estimated in RTECS by disaggregating the annual VMT from odometer 
              readings into monthly VMT. The disaggregation was performed as follows:
            
            Where:
            Mi 
              = Annual VMT for vehicle i, calculated using odometer readings and 
              the two-step adjustment procedure
            discussed 
              in the section titled "Vehicle Miles Traveled"
            f(i,j) 
              = Average fraction of "annual" VMT that was driven during 
              month j, estimated for vehicle i
            There 
              is no single distribution of average monthly VMT fractions f(ij). 
              Rather, there was a family of distributions, the members of which 
              were determined by the particular months a vehicle was owned or 
              used by a household. According to this definition of monthly VMT 
              fractions, no matter which months vehicle i was in a household, 
              it was always true that:
            
            The 
              f(i,j) were derived from the Fj in Table B1
              as follows:
            
            Otherwise
            
            Substituting 
              mpgij = MPGij(in-use) and mij = 
              Mi x f(i,j) into Equation 13.
            yields 
              the following estimate of annual consumption for vehicle i:
            
            The 
              estimator of annual consumption in the above equation was constructed 
              with 1994 RTECS data.
            For 
              vehicles that were acquired or disposed of during 1994, the estimator 
              took into account seasonal differences in the overall fuel economy 
              and the effects of these differences on the overall fuel consumption.
            Substituting 
              MPG(EPA 55/45) in the above equation, and slightly rearranging 
              the terms, the estimator of consumption is:
            
            A 
              single "annualized" fuel economy that is analogous to 
              the "annualized" MPGi from previous RTECS, 
              was estimated as:
            
            Thus
            
            **Annual 
              Vehicle-Fuel Expenditures and Price**
            **Vehicle 
              Fuel Expenditures**
            In 
              the 1994 RTECS, fuel expenditures were calculated by multiplying 
              the vehicle-fuel consumption by the price of the vehicle fuel. The 
              1994 RTECS, like the 1988 and 1991 RTECS, did not collect vehicle 
              fuel prices via fuel purchase diaries. Instead, each RTECS vehicle 
              was assigned a price based on reported fuel type used in the vehicle. 
              Gasoline prices were obtained from the BLS 1994 Retail Gasoline 
              Pump Price Series. Diesel fuel prices were obtained from the Lundberg 
              Survey, Inc. (See "Other Fuel Types" in this appendix 
              for a discussion of the gasohol and propane prices.)
            Respondents 
              were asked if they purchased leaded or unleaded gasoline, and if 
              unleaded, they were asked the grade. (See Appendix D, "Survey 
              Forms.") The BLS prices are published by month, by Census region, 
              and by type and grade of fuel. In 1988, the BLS monthly prices (for 
              the Census region in which the household lived) were averaged across 
              the months that the vehicle was in the possession of the household. 
              This yielded for each RTECS vehicle a single fuel price, Pi, 
              dependent on the Census region, type and grade of gasoline, and 
              the months that the vehicle was in the possession of the household. 
              In 1988, the annual fuel expenditures in dollars for each sample 
              vehicle, Ei, was estimated by multiplying its assigned 
              average fuel price, Pi, by its total consumption in gallons, 
              Ci, as estimated in the previous section. However, in 
              1994, annual fuel expenditures, Ei, was estimated by 
              multiplying monthly gasoline prices by monthly consumption to produce 
              monthly expenditures and summing the monthly expenditures to produce 
              annual expenditures.
            **Type 
              of Fuel Used**
            Table
              B2 provides the percentage distribution of RTECS vehicles by fuel 
              type categories. In 1994, 97.9 percent of the 156.8 million RTECS 
              vehicles used unleaded gasoline. The remaining 6.3 percent of vehicles 
              used leaded gasoline, diesel fuel or other fuel types.
            **Table
            B2. Distribution of Residential Transportation nergy Consumption Survey 
            Vehicles by Type** **of Fuel Used, 1994** 
            Type 
                    of Vehicle Fuel
                Number 
                  of Vehicles millions)
                Percent 
                    of Vehicles**Total**
                156.8
                100.0**Gasoline** Leaded
                  Unleaded
                  Regular
                  Premium
                  Intermediate
                153.4
                  Q 
                  151.5 
                  14.2 
                  26.7 
                  20.6
                97.9 
                  
                  Q 
                  96.7 
                  66.4 
                  17.1
                  13.2**Diesel**
                1.8
                1.1**Gasohol**
                1.4
                0.9Notes: 
              Because of rounding, data may not sum to totals. For a discussion 
              of underreporting of gasohol see Appendix C,
            "Quality 
              of the Data."
            Q 
              = Data withheld either because the Relative Standard Error (RSE) 
              was greater than 50 percent or fewer than 10 households were sampled.
            Source: 
              Energy Information Administration, Office of Energy Markets and 
              End Use, 1994 Residential Transportation
            Energy 
              Consumption Survey.
            **Gasoline 
              Prices**
            Prices 
              published by the BLS survey are retail prices for leaded regular, 
              unleaded regular, and unleaded premium gasoline. These prices are 
              published monthly by Census region. The BLS Pump Price Survey is 
              conducted as input to the *Consumer Price Index (CPI)*. Prices 
              are collected in 85 urban areas. The population covered excludes 
              the institutional population and households located on military 
              bases. The covered population includes approximately 85 percent 
              of all U.S. households. The BLS uses a rotating sample of approximately 
              1,100 service stations.
            Each 
              vehicle in the 1994 RTECS, that used gasoline was assigned a monthly 
              BLS fuel price. The BLS "unleaded regular" price was assigned 
              to all vehicles that reported using leaded gasoline..
            **Diesel 
              Fuel Prices**
            Diesel 
              fuel prices were obtained from the "Lundberg Letter-PS" 
              published by Lundberg Survey, Inc. The Lundberg Survey, Inc. collects 
              pump prices at retail service stations in approximately 80 major 
              metropolitan markets. The survey includes about 15,000 service stations 
              divided into 2 bimonthly panels. At least one city from every State 
              is included. Service stations on military bases and in rural areas 
              are excluded. Sales-weighted price data for both full-and self-service 
              stations are published bimonthly. Regional prices are not published. 
              All RTECS vehicles that used diesel fuel were assigned the same 
              diesel fuel prices regardless of Census region.
            For 
              the RTECS, the following two steps were used to create diesel prices. 
              (1) Bimonthly diesel fuel full-service and self-service prices, 
              obtained from the Lundberg Letter-PS, were averaged to create prices 
              for each grade in the intermediate months. (2) The monthly full- 
              and self-service prices were then weighted and averaged to obtain 
              overall diesel fuel prices. The weights used to create an average 
              diesel fuel price from the full- and self-service prices were based 
              on RTECS data on "type of service" (full-service or self-/mini-service) 
              used when purchasing diesel fuel. For each vehicle monthly prices 
              were multiplied by monthly consumption to yield monthly expenditures. 
              The monthly expenditures were summed to produce annual expenditures.
            Other 
              Fuel Type Prices
            Approximately 
              1.4 million 1994 RTECS vehicles were reported using gasohol. In 
              the absence of applicable national estimates of the average price 
              paid for gasohol, the RTECS vehicles using gasohol were assigned 
              fuel prices using the same methodology as the most common group 
              of vehicles in the survey--vehicles using regular unleaded gasoline. 
              (See above for methodology assigning unleaded regular gasoline prices 
              and Appendix C, "Quality of the Data" for a discussion 
              of RTECS underestimation of other fuels.)
            **References**
            1. 
              Crawford, R. 1983. *"Seasonal and Regional MPG as Influenced 
              by Environmental Conditions and Travel Patterns."* Research 
              performed under contract for DOE. Energy and Environmental Analysis, 
              Inc., Arlington, VA.
            2. 
              Harrison, I.M. *"Retail Fuel Pump-Prices,"* Residential 
              Transportation Energy Consumption Survey Technical Note 4, unpublished 
              document. (Washington, DC, 1994).
            3. 
              Harrison, I.M. *"VMT 1994 Patterns,"* Residential 
              Transportation Energy Consumption Survey Technical Note 5, unpublished 
              document. (Washington, DC, 1994).
            4. 
              Hellman, K.H., and Murrell, J.D. 1985. *"On the Stability 
              of the EPA MPG Adjustment Factors."* Society of Automotive 
              Engineers Technical Paper Series, SAE Paper No. 851216, Warrendale, 
              PA.
            5. 
              Hellman, K.H., and Murrell, J.D. 1984. *"Development of 
              Adjustment Factors for the EPA City and Highway MPG Values."* 
              Society of Automotive Engineers Technical Paper Series, SAE Paper 
              No. 840496, Warrendale, PA.
            6. 
              Lax, D. 1987. *"Feasibility of Estimating In-Use Vehicle 
              Fuel Efficiency from Household Survey Data."* Research 
              performed under contract for ORNL/DOE/EIA. Energy and Environmental 
              Analysis Inc., Arlington, VA.
            7. 
              *"Lundberg Letter-PS,"* Lundberg Survey Inc. 1994. 
              (North Hollywood, CA).
            8. 
              U.S. Department of Energy and U.S. Environmental Protection Agency, 
              *Gas Mileage Guide, EPA Fuel Economy Estimates*. (Washington, 
              DC).
            9. 
              *"Average Prices for Gasoline, U.S. City Average and Selected 
              Areas,"*U.S. Department of Labor, Bureau of Labor Statistics, 
              1994. (Washington, DC).
            
            File Last Modified: August 25, 1997
            If you are having any technical problems with this 
            site, please contact the EIA Webmaster at wmaster@eia.doe.gov
|**Appendix B**
      **Estimation Methodologies**
      **Introduction**
            Statistics 
              concerning vehicle miles traveled (VMT), vehicle fuel efficiency 
              (given in terms of miles per gallon (MPG)), vehicle fuel consumption, 
              and vehicle fuel expenditures are presented in this report. The 
              methodology used to estimate these statistics relied on data from 
              the 1993 Residential Energy Consumption Survey (RECS), the 1994 
              Residential Transportation Energy Consumption Survey (RTECS), the 
              U.S. Environmental Protection Agency (EPA) fuel efficiency test 
              results, the U.S. Bureau of Labor Statistics (BLS) retail pump price 
              series, and the Lundberg Survey, Inc., price series for 1994.
            The 
              estimation of these four statistics (VMT, vehicle fuel efficiency, 
              vehicle fuel consumption, and vehicle fuel expenditures) occurred 
              in several steps (Figure B1). First, for each RTECS vehicle, the 
              VMT were determined from two actual odometer readings or imputed 
              using data from the 1993 RECS. Second, the annual on-road fuel efficiency, 
              given in terms of MPG, was estimated using the questionnaire responses, 
              decoded Vehicle Identification Number (VIN) data, EPA fuel efficiency 
              test results, and the months that the vehicle was in use. The MPG 
              were adjusted to account for the difference between EPA test values 
              and on-road values. Third, estimated vehicle fuel consumption was 
              derived by dividing the VMT by the estimated MPG. Finally, the estimated 
              vehicle fuel expenditures were derived by multiplying the vehicle 
              fuel consumption by the fuel price. The 1994 RTECS, like the 1988 
              RTECS, did not collect vehicle fuel prices via fuel purchase diaries. 
              Instead each RTECS vehicle was assigned a price based on reported 
              fuel type used in each vehicle. Gasoline prices were obtained from 
              the BLS 1994 Retail Gasoline Pump Price Series. Diesel fuel prices 
              were obtained from the Lundberg Survey, Inc. (See "Other Fuel 
              Types" in this appendix for a discussion of the gasohol and 
              propane prices.)
            The 
              following sections of this appendix describe the estimation procedures 
              used for calculating the VMT, the MPG, the vehicle fuel consumption, 
              the vehicle fuel prices, and the vehicle fuel expenditures. Also 
              described in this appendix are the sources of data that were used 
              in the estimation procedures.
            The 
              following terms are used throughout this appendix:
            **Terms**
                **Definitions**EPA 
                  Composite MPG
                The 
                  EPA dynamometer test procedure, performed on preproduction prototype 
                  vehicles, yields separate test values for EPA city and highway 
                  MPG. These city and highway MPG are often combined to form the 
                  "composite" MPG.On-Road 
                  MPG
                A 
                  composite MPG that was adjusted to account for the shortfall 
                  between the test value and the fuel efficiency actually obtained 
                  on the road. The adjustment did not take into account the driving 
                  patterns of individual drivers and seasonal differences.In-Use 
                  MPG
                MPG 
                  that were adjusted for seasonal differences and annual miles 
                  driven. Vehicles that are driven relatively few miles during 
                  the year are assumed to be driven mostly on short trips that 
                  involve frequent stops. Vehicles that are driven relatively 
                  many miles are assumed to be driven mostly on long trips where 
                  few stops are needed.MPG 
                  Shortfall
                A 
                  measure of the difference between actual on-road MPG and the 
                  EPA laboratory test MPG. Expressed as the ratio of test MPG 
                  to on-road MPG.**Vehicle 
              Miles Traveled**
            When 
              possible, VMT were determined for a sample vehicle by taking the 
              difference between two odometer readings, which spanned a period 
              of time. This method was used to determine VMT for 2,648 (48 percent) 
              of the 5,553 RTECS sample vehicles. Attempts were made to obtain 
              odometer readings during the RECS interviews, the End-of-Year (E-O-Y) 
              RTECS interview and any time a vehicle was acquired or disposed. 
              A "span" of odometer readings was the difference between 
              two odometer readings. In most cases, this span was a B-O-Y to E-O-Y 
              span, although due to an occasional nonresponse, only shorter spans 
              were obtained, such as RECS to B-O-Y. Odometer spans of less than 
              a full year were also obtained for vehicles that were either acquired 
              or disposed of during the survey year.
            The 
              VMT that were assigned to each RTECS vehicle corresponded to the 
              period of time that the vehicle was in possession by the sample 
              household. In most cases, however, this period of possession did 
              not correspond exactly with the beginning and ending dates for the 
              odometer span. This was true even for vehicles with a complete B-O-Y 
              to E-O-Y odometer span; because odometer cards were mailed to respondents 
              in several distinct waves at the beginning and end of the RTECS 
              survey; and because the exact dates of odometer readings were often 
              left to the convenience of the respondents. Therefore, all VMT obtained 
              from odometer spans were adjusted to correspond to the period of 
              time that the vehicle was in possession by the sample household. 
              A 2-step adjustment procedure was used. STEP 1 adjusted the odometer-span 
              VMT to a standard annualized mileage covering 365 days, and STEP 
              2 readjusted the annualized VMT to correspond to the exact period 
              of time that the vehicle was in possession by the household. These 
              adjustments took into account a typical distribution of VMT fractions 
              among the different months of the year. Step 2 was performed only 
              for vehicles that were not in the possession of the household for 
              the entire calendar year 1994.
            **STEP 
              1:**
            This 
              step adjusted the odometer-span VMT to a standard annualized VMT 
              covering a full year, regardless of whether the span of odometer 
              readings covered approximately 1 year or only a short span of time. 
              Annualized VMT for vehicle i were computed as:
            
            Where: Fj 
              = Monthly VMT fractions from the standard distribution in Table
              B1 soi 
              = Month of starting odometer readings for vehicle i 
              eoi 
              = Month of ending odometer readings for vehicle i. 
              The 
              starting and ending Fj were prorated according to the 
              exact day of the month for the odometer readings. For example, if 
              a final odometer reading was taken on September 15, then (14/30) 
              x FSEP was used.
            **Table
              B1.Distribution of Average Monthly Vehicle Miles Traveled Fractions**
            Month 
                    j
                Average 
                    VMT per Vehicle
                FjJanuary
                688
                0.0728February
                697
                0.0738March
                771
                0.0816April
                783
                0.0829May
                832
                0.0880June
                847
                0.0896July
                868
                0.0919August
                872
                0.0923September
                800
                0.0847October
                802
                0.0849November
                756
                0.0800December
                734
                0.0777Total
                9,450
                1.0000Source: 
              1984 Petroleum Marketing Index (PMI) Survey, NPD Research Inc. The 
              survey is a demographically and geographically balanced-quota sample 
              of 4,100 households. Respondents maintained fuel purchase diaries 
              for an average of 10 months. As part of the survey, information 
              was collected on the characteristics of trips taken in vehicles 
              during a designated day. Trip lengths were recorded as respondent 
              perception rather than from odometer readings. The distribution 
              of monthly mileage fractions has been obtained from this survey.
            **STEP 
              2:**
            Once 
              an annualized VMT was obtained from STEP 1 as described earlier, 
              it was adjusted to correspond to the time period that vehicle i 
              was in possession by the sample household as:
            
            Where:
            Fj 
              = Monthly VMT fractions from the standard distribution in Table
              B1
            spi 
              = Month starting possession of vehicle i by the household, or January 
              1994, whichever is later
            epi 
              = Month ending possession of vehicle i by the household, or December 
              1994, whichever is earlier.
            If 
              vehicle i was in the household for the entire year then spi 
              = JAN and epi = DEC. If a vehicle was acquired or disposed 
              of during the survey, the starting or ending Fj was prorated 
              according to the appropriate day of the month.
            To 
              ensure that the distribution of average monthly vehicle miles traveled 
              fractions given in Table B1 reflected 1994 driving patterns, a study
              of Federal Highway Administration (FHWA) Traffic Volume data for 
              1994 was conducted. This study resulted in FHWA VMT fractions being 
              constructed for 1984 and 1993. FHWA 1993 data were used since the 
              1994 data for the entire year was unavailable. Annual VMT calculations 
              were completed using both the NPD and FHWA fractions. The differences 
              in average annual VMT per vehicle between using the NPD and FHWA 
              VMT fractions ranged between 1 and 18 miles and were less than the 
              standard errors of the average annual VMT. Therefore, in 1994 the 
              NPD VMT fractions given in Table B1 will be used to compute annualized
              VMT since the differences in annual VMT between using the NPD and 
              FHWA fractions were minor (RTECS Technote 5[3]).
            **Incomplete 
              Odometer or VMT Data**
            For 
              1,927 sample vehicles (35 percent), no odometer span was available, 
              although an estimate of annual VMT had been obtained from the respondent 
              during the RECS interview. VMT for these vehicles were imputed from 
              a regression on the estimated VMT obtained from the RECS. For another 
              978 sample vehicles (17 percent), no odometer span was available 
              and a VMT estimate was not obtained during the RECS interview. VMT 
              for these vehicles were imputed using a multiple linear regression 
              model, where the independent variables were number of drivers, household 
              income, age of household head, type of vehicle, and use of vehicle 
              on the job. This regression was also used for imputing VMT for vehicles 
              that were imputed as being acquired or disposed. Both of the regression 
              models described above yielded estimates of annualized VMT. The 
              STEP 2 adjustment described previously was then used to adjust this 
              VMT to correspond with the time the vehicle was in the possession 
              of the household.
            **Vehicle 
              Fuel Efficiency**
            Fuel 
              efficiency (MPG) must be estimated for each RTECS sample vehicle 
              in order to estimate each vehicle's fuel consumption for the survey 
              year. (Fuel consumption is estimated by dividing the VMT for time 
              of possession, by the MPG.) Prior to 1988, the RTECS obtained actual 
              fuel consumption data and on-road MPG from fuel purchase diaries 
              maintained by the respondents. However, no fuel purchase diaries 
              were used in the 1988 thru 1994 RTECS. Instead, the 1994 MPG were 
              estimated using EPA laboratory test MPG that were adjusted to account 
              for differences between actual on-road MPG and the EPA test MPG. 
              This difference is known as MPG "shortfall." The feasibility 
              of using shortfall-adjusted MPG in an RTECS survey was investigated 
              by Lax, 1987[6]. That study verified that the method yielded unbiased 
              MPG, when using a data base from a 1984 fuel purchase diary study 
              performed by NPD Research, Inc. The adequacy of current shortfall 
              adjustment methods is sufficient for late 1980 through early 1993's 
              motor vehicle model years also (RTECS Technote 5[3]).
                    The 
              RTECS sample vehicles were assigned EPA test MPG from the EPA Emissions 
              Certification Files. Each record of the Certification Files contained 
              EPA test MPG for each unique combination of vehicle attributes within 
              a given make, model, and year. These attributes were (1) number 
              of cylinders, (2) cubic inches of engine displacement (CID), (3) 
              type of transmission (manual or automatic), (4) gasoline or diesel 
              fuel, and (5) whether the vehicle's emissions control package met 
              Federal or California standards. Each record of the Certification 
              Files also contained the number of vehicles sold for each unique 
              combination of attributes. The vehicle attributes needed to assign 
              a test MPG for sample vehicles were obtained from the Vehicle Identification 
              Number (VIN), and/or from the RTECS questionnaire responses when 
              the VIN was unavailable. The VIN was decoded to yield the vehicle 
              attributes, by use of the Highway Loss Data Institute's "Vindicator" 
              software.
            In 
              addition to assigning test MPG, the EPA Certification Files were 
              used to impute for missing vehicle attributes. Based on the nonmissing 
              vehicle attributes obtained from the questionnaire and VIN, several 
              records from the EPA Certification Files were usually found as potential 
              "matches" to a given sample vehicle. A matching record 
              was chosen from among the several applicable ones, with probability 
              proportional to sales, using the sales figures on the EPA Certification 
              Files. Once chosen, a record provided EPA test MPG (city and highway), 
              as well as any vehicle attributes that were missing.
            The 
              1994 RTECS used a sequential adjustment procedure where the EPA 
              Composite MPG was adjusted first to an on-road MPG, and then to 
              an in-use MPG.
            **The 
              EPA Composite MPG**
            Beginning 
              in the early 1970's, EPA measured fuel efficiency from tests that 
              were conducted on a dynamometer to simulate actual driving conditions. 
              By 1975, EPA had incorporated separate "city" and "highway" 
              driving cycles into the test. The city and highway MPG were combined 
              to form a "composite" MPG, that was then weighted according 
              to sales of the production vehicles in order to assess compliance 
              with Corporate Average Fuel Economy (CAFE) standards. The EPA Composite 
              MPG is based on the assumption of a "typical" vehicle-use 
              pattern of 55 percent city driving and 45 percent highway driving, 
              and has become a convenient single fuel efficiency measure for analytical 
              and regulatory purposes.
            The 
              EPA Composite MPG is defined as:
            
            where:
            MPG(EPA 
              55/45) = the composite MPG
            MPG(EPA 
              city) = the fuel efficiency when vehicle use pattern is city 
              driving only
            MPG(EPA 
              highway) = the fuel efficiency when vehicle use pattern is 
              highway driving only.
            **Fuel 
              Efficiency Shortfall**
            Fuel 
              efficiency shortfall occurs when the fuel efficiency that is actually 
              obtained while using the vehicle is lower than the EPA test results. 
              Reasons for this shortfall are (1) a result of the differences between 
              EPA test vehicles and the vehicles actually in use and (2) the differences 
              between EPA procedures for simulated driving conditions and actual 
              driving conditions. For example, EPA test vehicles are prototypes 
              that do not contain the wide variety of power-consuming accessories 
              often found on vehicles sold to consumers. The test procedures also 
              do not simulate the actual driving conditions that affect fuel efficiency 
              such as speed and acceleration of individual drivers, road conditions, 
              weather, and traffic. In the 1994 RTECS, adjustments for this fuel 
              efficiency shortfall were made to the composite MPG (MPG(EPA 
              55/45)) that were assigned to the sample vehicles.
            Fuel 
              efficiency shortfall was expressed in terms of the "Gallons 
              per Mile Ratio" or GPMR:
            
            Where:
            GPMRi 
              = Gallons per Mile Ratio for vehicle i
            MPGi 
              = On-road MPG or in-use MPG for vehicle i, depending on the analysis
            MPG(EPA 
              55/45) = EPA Composite MPG applicable to vehicle i.
            If 
              GPMRi = 1 then there is no shortfall. If GPMRi 
              > 1 then there is a shortfall for vehicle i (That is, the on-road 
              or in-use fuel efficiency is less than the fuel efficiency indicated 
              by the EPA Composite MPG.) Note that GPMRi can represent 
              shortfall with respect to either the on-road or in-use MPGi, 
              depending on the analysis being performed. GPMRi is commonly 
              chosen as a measure of shortfall as opposed to MPGi for 
              the following reasons:
            A 
              shortfall adjustment is most often thought of as a correction factor,
              or multiplicative constant, rather than as an additive correction. 
              GPMRi satisfies this convention.
            Shortfall 
              is usually dependent on a vehicle's fuel efficiency level. That 
              is, shortfall is usually higher at high levels of MPG(EPA 55/45) 
              than at low levels of MPG(EPA 55/45). Therefore, it is 
              more informative to express the amount of shortfall relative to 
              MPG(EPA 55/45) rather than as an absolute quantity.
            GPMRi 
              is a linear function of MPG(EPA 55/45) and can be modeled 
              using ordinary least squares linear regression.
            GPMRi 
              is a transformation that stabilizes error variances for the purposes 
              of least squares linear regression.
            **The 
              On-Road MPG**
            On-road 
              MPG is a composite MPG that was adjusted to account for the shortfall 
              between the EPA fuel efficiency and the actual fuel efficiency obtained 
              on the road.
            The 
              EPA developed two general procedures for adjusting MPG(EPA 
              55/45) to an on-road value. One procedure bases the size of 
              the adjustment on specific technology features of the vehicle. The 
              other procedure uses just two MPG discount factors, one to adjust 
              the EPA highway estimate, the other to adjust the city estimate. 
              These two factors are used for all vehicles, regardless of technology 
              class. Either of these procedures could be used to adjust MPG(EPA 
              55/45) to an on-road MPG value for use in the 1994 RTECS. 
              Since both procedures were unbiased for trucks, the choice as to 
              which to employ in the 1994 RTECS should be based on their performance 
              with cars. The adjustment based on discount factors seemed to be 
              less biased than the Technology-Specific Adjustment. The discount 
              factors are also less expensive since they do not require collection 
              or imputation of information on fuel delivery system and drive-train. 
              Because of these reasons the Discount Factors Adjustment Method 
              was selected.
            **Shortfall 
              Adjustment Based on Discount Factors**
            EPA's 
              discount factors have widespread appeal because of their simplicity 
              (Hellman and Murrell, 1985[4]; Hellman and Murrell, 1984[5]). The 
              factors are .10 percent for city MPG and .22 percent for highway 
              MPG. That is, for any vehicle i,
            
            These 
              discount factors are the ones used to produce the "sticker" 
              MPG figures seen on vehicles on dealer lots, and are used to produce 
              the DOE/EPA *Gas Mileage Guide*. The analysis behind the 
              development of these factors was performed on a conglomerate data 
              base with data from Ford Motor Company, General Motors, Chrysler 
              Corporation, DOE, and EPA. The data base contained approximately 
              38,000 vehicle records with model years from 1979 through 1981 with 
              some 1982 models included. The data base contained predominately 
              American-made vehicles, but also included foreign vehicles as well. 
              The technology mix was dominated by rear-wheel drive and carbureted 
              vehicles, but contained some vehicles with front-wheel drive or 
              fuel injection. Vehicle records contained make, model, year, vehicle 
              characteristics, the MPG as measured on the road, MPG(EPA city), 
              and MPG(EPA highway). The data base also
            included 
              the driver's perceptions of the proportion of their travel that 
              was mostly urban (so called "city fraction"), and their 
              average miles driven per day (AMPD).
            Fuel 
              economy shortfall is affected by the vehicle use pattern: city-driving 
              pattern is characterized by frequent starts and short trip lengths, 
              while highway-driving pattern is characterized by infrequent starts 
              and long trips. AMPD is a good surrogate variable for representing 
              these different driving patterns.
            The 
              city-driving pattern was characterized by AMPD from 5 to 22 miles 
              per day, while the highway-driving pattern was characterized by 
              AMPD's from 15 to 105 miles per day (Hellman and Murrell, 1984). 
              City fraction and AMPD were used to split the data into two sets, 
              one for development of the city discount factor, the other for development 
              of the highway factor. The "city" and "highway" 
              data sets were each stratified by vehicle technology classes. Linear 
              regression was performed within each stratum. GPMR was regressed 
              on city fraction, AMPD, MPG(EPA 55/45), odometer reading, 
              and average temperature. The fitted models were then weighted and 
              combined across vehicle technology strata, to produce a single "city" 
              shortfall model and a single "highway" shortfall model. 
              The weights were used to increase the influence of those models 
              that represented technology mixes expected to become more prominent 
              in the future (e.g., front-wheel drive and fuel-injected vehicles). 
              The discount factors were derived from the two weighted models set 
              at average or typical values of the independent variables.
            
            For 
              each RTECS vehicle, discounted city and highway on-road MPG were 
              computed and then combined to form an on-road 55/45 composite as 
              follows:
            
            A 
              shortfall ratio based on EPA discount factors was computed for each 
              RTECS vehicle as follows:
            
            **The 
              In-Use MPG**
            In-use 
              MPG are MPG that are adjusted for individual driving circumstances. 
              The on-road adjustments to MPG(EPA 55/45) discussed in 
              the previous sections were "general" in that they did 
              not take into account any effects on fuel economy that are due to 
              the driver's individual circumstances. They, instead, utilized general 
              attributes such as the technology features of the vehicle and average 
              driving conditions. Fuel economy shortfall estimates can be refined 
              for an individual vehicle by taking into account the following "in-use" 
              effects.
            Urban 
              versus rural driving pattern. That is, frequent starts and short 
              trips as opposed to infrequent starts and longer trips. As mentioned 
              in the previous section, a useful single variable for representing 
              this effect is AMPD. High AMPD's usually represent mileage accumulated 
              on the highway.
            Traffic 
              congestion, which increases with population density.
            Seasonal 
              temperature variations, especially for gasoline-carbureted vehicles.
            Humidity, 
              which together with temperature, affects air-conditioner use.
            Differences 
              among geographic areas of the country.
            Altitude.
            Wind.
            Road 
              gradient and road surface conditions.
            In 
              general, the first four items are considered the most significant 
              in-use influences (Crawford, 1983[1]). In the cited study, shortfall 
              variations as high as 25 percent or more occurred over the range 
              of typical AMPD. Shortfall was 16 percent higher in urban areas 
              than in completely uncongested areas, and was 12 percent higher 
              in suburban areas. Shortfall varied seasonally (i.e., monthly) by 
              7 percent in the South and by 13 percent in the North.
            Regression 
              models were developed (Crawford, 1983) for use in adjusting GPMRi(on-road) 
              to an in-use shortfall employing measurements of several in-use 
              effects as the independent variables.
            The 
              regressions yielded a shortfall adjustment that was an additive
              one, as follows:
            
            where:
            GPMRij(in-use)= 
              the in-use shortfall ratio estimated for vehicle i and month j (j 
              = 1...12), GPMRi(on-road) = the on-road shortfall ratio 
              estimated for vehicle i, from the above equations, and
            ij 
              = an adjustment calculated for vehicle i and month j, from a regression 
              model.
            
            One 
              regression model from the Crawford reference which is appropriate 
              for use in RTECS is as follows:
            
            Where:
            AMPDij 
              = Average Miles per Day for vehicle i and month j, typically 35.6 
              (i.e., 13,000 miles per year).
            NORTH 
              = 1 if the household is in the North.
            0 
              if the household is not in the North.
            SOUTH 
              = 1 if the household is in the South.
            0 
              if the household is not in the South.
            This 
              regression model was chosen because the independent variables that 
              are important in explaining shortfall were readily available from 
              the 1994 RTECS data. The model had two components. One component 
              involved AMPDij and represented the influence of individual 
              driving patterns for a given vehicle and month. The other component 
              represented the change in shortfall that occurred throughout the 
              seasons, due to the annual temperature cycle. The original regression 
              equation also contained a minor term which accounted for the influence 
              of air-conditioner use during hot, humid weather. This term was 
              dropped in the 1994 RTECS estimations because it involved the rather 
              complex computation of "Discomfort Index" from NOAA weather 
              records, and the slight additional precision was judged insufficient 
              to warrant the additional processing expense. Additional terms representing 
              geographic regional effects, and the natural logarithm of population 
              density (people per square mile, to represent the influence of traffic 
              congestion) were not considered because of the computational cost.
            Once 
              a GPMRij(in-use) was estimated it was used to estimate 
              the final in-use fuel economy for vehicle i and month j as follows:
            
            The 
              regression equation had separate seasonal components for the "North" 
              and "South," because the difference between the winter 
              shortfall and the summer shortfall was greater in the North than 
              in the South. This difference can be seen in the model parameters. 
              To define the North and South geographic areas the continental United 
              States were divided into 97 two-digit ZIP Code regions. These regions 
              were grouped to form two aggregate regions ("North" and 
              "South") according to average winter and summer temperatures, 
              and seasonal shortfall trends.
            **Annual 
              Vehicle Fuel Consumption**
            In 
              the 1994 RTECS, annual consumption was calculated by dividing the 
              annual VMT by the annual MPG. The following is a derivation of the 
              annual VMT and annual MPG.
            The 
              MPGij(in-use) shown in the above section about fuel efficiency 
              estimation procedures were final estimates of monthly in-use fuel 
              economies for vehicle i, and could have been used for estimating 
              monthly fuel consumptions and expenditures if monthly VMT were known. 
              However, RTECS collected only annual VMT, as calculated from the 
              B-O-Y and E-O-Y odometer readings. Nevertheless, the 1994 RTECS 
              still made use of the MPGij(in-use) by disaggregating 
              the annual VMT of sample vehicles into monthly VMT.
            The 
              annual consumption for vehicle i can be thought of as the sum of 
              the individual monthly consumptions:
            Where:
            Ci 
              = Annual consumption of vehicle fuel for vehicle i, in gallons
            spi 
              = Month starting possession of vehicle i by the household, or January 
              1994, whichever is later
            epi 
              = Month ending possession of vehicle i by the household, or December 
              1994, whichever is earlier
            
            cij 
              = Consumption of vehicle fuel for vehicle i, during month j.
            Consumption 
              is calculated over only those months that vehicle i was reported 
              to be owned or used by the household. In this sense, "annual" 
              does not necessarily mean a full 12 months. This is an important 
              point since fuel economy varies seasonally. If vehicle i was in 
              the household for the entire year, then spi = JAN and 
              epi = DEC.
            Consumption 
              for each month can be expressed in terms of monthly VMT and monthly 
              fuel economy:
            
            Where:
            mij 
              = VMT for vehicle i, month j
            mpgij 
              = Fuel economy in miles per gallon for vehicle i, month j
            so 
              that:
            
            In 
              the 1994 RTECS Ci was estimated by substituting the estimated 
              MPGij(in-use) for mpgij. The mij 
              was estimated in RTECS by disaggregating the annual VMT from odometer 
              readings into monthly VMT. The disaggregation was performed as follows:
            
            Where:
            Mi 
              = Annual VMT for vehicle i, calculated using odometer readings and 
              the two-step adjustment procedure
            discussed 
              in the section titled "Vehicle Miles Traveled"
            f(i,j) 
              = Average fraction of "annual" VMT that was driven during 
              month j, estimated for vehicle i
            There 
              is no single distribution of average monthly VMT fractions f(ij). 
              Rather, there was a family of distributions, the members of which 
              were determined by the particular months a vehicle was owned or 
              used by a household. According to this definition of monthly VMT 
              fractions, no matter which months vehicle i was in a household, 
              it was always true that:
            
            The 
              f(i,j) were derived from the Fj in Table B1
              as follows:
            
            Otherwise
            
            Substituting 
              mpgij = MPGij(in-use) and mij = 
              Mi x f(i,j) into Equation 13.
            yields 
              the following estimate of annual consumption for vehicle i:
            
            The 
              estimator of annual consumption in the above equation was constructed 
              with 1994 RTECS data.
            For 
              vehicles that were acquired or disposed of during 1994, the estimator 
              took into account seasonal differences in the overall fuel economy 
              and the effects of these differences on the overall fuel consumption.
            Substituting 
              MPG(EPA 55/45) in the above equation, and slightly rearranging 
              the terms, the estimator of consumption is:
            
            A 
              single "annualized" fuel economy that is analogous to 
              the "annualized" MPGi from previous RTECS, 
              was estimated as:
            
            Thus
            
            **Annual 
              Vehicle-Fuel Expenditures and Price**
            **Vehicle 
              Fuel Expenditures**
            In 
              the 1994 RTECS, fuel expenditures were calculated by multiplying 
              the vehicle-fuel consumption by the price of the vehicle fuel. The 
              1994 RTECS, like the 1988 and 1991 RTECS, did not collect vehicle 
              fuel prices via fuel purchase diaries. Instead, each RTECS vehicle 
              was assigned a price based on reported fuel type used in the vehicle. 
              Gasoline prices were obtained from the BLS 1994 Retail Gasoline 
              Pump Price Series. Diesel fuel prices were obtained from the Lundberg 
              Survey, Inc. (See "Other Fuel Types" in this appendix 
              for a discussion of the gasohol and propane prices.)
            Respondents 
              were asked if they purchased leaded or unleaded gasoline, and if 
              unleaded, they were asked the grade. (See Appendix D, "Survey 
              Forms.") The BLS prices are published by month, by Census region, 
              and by type and grade of fuel. In 1988, the BLS monthly prices (for 
              the Census region in which the household lived) were averaged across 
              the months that the vehicle was in the possession of the household. 
              This yielded for each RTECS vehicle a single fuel price, Pi, 
              dependent on the Census region, type and grade of gasoline, and 
              the months that the vehicle was in the possession of the household. 
              In 1988, the annual fuel expenditures in dollars for each sample 
              vehicle, Ei, was estimated by multiplying its assigned 
              average fuel price, Pi, by its total consumption in gallons, 
              Ci, as estimated in the previous section. However, in 
              1994, annual fuel expenditures, Ei, was estimated by 
              multiplying monthly gasoline prices by monthly consumption to produce 
              monthly expenditures and summing the monthly expenditures to produce 
              annual expenditures.
            **Type 
              of Fuel Used**
            Table
              B2 provides the percentage distribution of RTECS vehicles by fuel 
              type categories. In 1994, 97.9 percent of the 156.8 million RTECS 
              vehicles used unleaded gasoline. The remaining 6.3 percent of vehicles 
              used leaded gasoline, diesel fuel or other fuel types.
            **Table
            B2. Distribution of Residential Transportation nergy Consumption Survey 
            Vehicles by Type** **of Fuel Used, 1994** 
            Type 
                    of Vehicle Fuel
                Number 
                  of Vehicles millions)
                Percent 
                    of Vehicles**Total**
                156.8
                100.0**Gasoline** Leaded
                  Unleaded
                  Regular
                  Premium
                  Intermediate
                153.4
                  Q 
                  151.5 
                  14.2 
                  26.7 
                  20.6
                97.9 
                  
                  Q 
                  96.7 
                  66.4 
                  17.1
                  13.2**Diesel**
                1.8
                1.1**Gasohol**
                1.4
                0.9Notes: 
              Because of rounding, data may not sum to totals. For a discussion 
              of underreporting of gasohol see Appendix C,
            "Quality 
              of the Data."
            Q 
              = Data withheld either because the Relative Standard Error (RSE) 
              was greater than 50 percent or fewer than 10 households were sampled.
            Source: 
              Energy Information Administration, Office of Energy Markets and 
              End Use, 1994 Residential Transportation
            Energy 
              Consumption Survey.
            **Gasoline 
              Prices**
            Prices 
              published by the BLS survey are retail prices for leaded regular, 
              unleaded regular, and unleaded premium gasoline. These prices are 
              published monthly by Census region. The BLS Pump Price Survey is 
              conducted as input to the *Consumer Price Index (CPI)*. Prices 
              are collected in 85 urban areas. The population covered excludes 
              the institutional population and households located on military 
              bases. The covered population includes approximately 85 percent 
              of all U.S. households. The BLS uses a rotating sample of approximately 
              1,100 service stations.
            Each 
              vehicle in the 1994 RTECS, that used gasoline was assigned a monthly 
              BLS fuel price. The BLS "unleaded regular" price was assigned 
              to all vehicles that reported using leaded gasoline..
            **Diesel 
              Fuel Prices**
            Diesel 
              fuel prices were obtained from the "Lundberg Letter-PS" 
              published by Lundberg Survey, Inc. The Lundberg Survey, Inc. collects 
              pump prices at retail service stations in approximately 80 major 
              metropolitan markets. The survey includes about 15,000 service stations 
              divided into 2 bimonthly panels. At least one city from every State 
              is included. Service stations on military bases and in rural areas 
              are excluded. Sales-weighted price data for both full-and self-service 
              stations are published bimonthly. Regional prices are not published. 
              All RTECS vehicles that used diesel fuel were assigned the same 
              diesel fuel prices regardless of Census region.
            For 
              the RTECS, the following two steps were used to create diesel prices. 
              (1) Bimonthly diesel fuel full-service and self-service prices, 
              obtained from the Lundberg Letter-PS, were averaged to create prices 
              for each grade in the intermediate months. (2) The monthly full- 
              and self-service prices were then weighted and averaged to obtain 
              overall diesel fuel prices. The weights used to create an average 
              diesel fuel price from the full- and self-service prices were based 
              on RTECS data on "type of service" (full-service or self-/mini-service) 
              used when purchasing diesel fuel. For each vehicle monthly prices 
              were multiplied by monthly consumption to yield monthly expenditures. 
              The monthly expenditures were summed to produce annual expenditures.
            Other 
              Fuel Type Prices
            Approximately 
              1.4 million 1994 RTECS vehicles were reported using gasohol. In 
              the absence of applicable national estimates of the average price 
              paid for gasohol, the RTECS vehicles using gasohol were assigned 
              fuel prices using the same methodology as the most common group 
              of vehicles in the survey--vehicles using regular unleaded gasoline. 
              (See above for methodology assigning unleaded regular gasoline prices 
              and Appendix C, "Quality of the Data" for a discussion 
              of RTECS underestimation of other fuels.)
            **References**
            1. 
              Crawford, R. 1983. *"Seasonal and Regional MPG as Influenced 
              by Environmental Conditions and Travel Patterns."* Research 
              performed under contract for DOE. Energy and Environmental Analysis, 
              Inc., Arlington, VA.
            2. 
              Harrison, I.M. *"Retail Fuel Pump-Prices,"* Residential 
              Transportation Energy Consumption Survey Technical Note 4, unpublished 
              document. (Washington, DC, 1994).
            3. 
              Harrison, I.M. *"VMT 1994 Patterns,"* Residential 
              Transportation Energy Consumption Survey Technical Note 5, unpublished 
              document. (Washington, DC, 1994).
            4. 
              Hellman, K.H., and Murrell, J.D. 1985. *"On the Stability 
              of the EPA MPG Adjustment Factors."* Society of Automotive 
              Engineers Technical Paper Series, SAE Paper No. 851216, Warrendale, 
              PA.
            5. 
              Hellman, K.H., and Murrell, J.D. 1984. *"Development of 
              Adjustment Factors for the EPA City and Highway MPG Values."* 
              Society of Automotive Engineers Technical Paper Series, SAE Paper 
              No. 840496, Warrendale, PA.
            6. 
              Lax, D. 1987. *"Feasibility of Estimating In-Use Vehicle 
              Fuel Efficiency from Household Survey Data."* Research 
              performed under contract for ORNL/DOE/EIA. Energy and Environmental 
              Analysis Inc., Arlington, VA.
            7. 
              *"Lundberg Letter-PS,"* Lundberg Survey Inc. 1994. 
              (North Hollywood, CA).
            8. 
              U.S. Department of Energy and U.S. Environmental Protection Agency, 
              *Gas Mileage Guide, EPA Fuel Economy Estimates*. (Washington, 
              DC).
            9. 
              *"Average Prices for Gasoline, U.S. City Average and Selected 
              Areas,"*U.S. Department of Labor, Bureau of Labor Statistics, 
              1994. (Washington, DC).
            
            File Last Modified: August 25, 1997
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            site, please contact the EIA Webmaster at wmaster@eia.doe.gov | EPA 
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            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                  Composite MPG                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | The 
                  EPA dynamometer test procedure, performed on preproduction prototype 
                  vehicles, yields separate test values for EPA city and highway 
                  MPG. These city and highway MPG are often combined to form the 
                  "composite" MPG.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|On-Road 
                  MPG                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | A 
                  composite MPG that was adjusted to account for the shortfall 
                  between the test value and the fuel efficiency actually obtained 
                  on the road. The adjustment did not take into account the driving 
                  patterns of individual drivers and seasonal differences.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|In-Use 
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                                                                                                                                                                                                       | MPG 
                  that were adjusted for seasonal differences and annual miles 
                  driven. Vehicles that are driven relatively few miles during 
                  the year are assumed to be driven mostly on short trips that 
                  involve frequent stops. Vehicles that are driven relatively 
                  many miles are assumed to be driven mostly on long trips where 
                  few stops are needed.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|MPG 
                  Shortfall                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | A 
                  measure of the difference between actual on-road MPG and the 
                  EPA laboratory test MPG. Expressed as the ratio of test MPG 
                  to on-road MPG.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        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