Certification is granted annually to individual engine families and is good for one model year.
Within an engine family, there may be one or more evaporative families that are associated with distinct vehicle models. All-terrain vehicles have two different tables depending on how they are certified. These website certification data for motor vehicles and engines have been compiled from the manufacturers' applications for certification. To view the descriptions of the abbreviations used in the reports, please click here . Manufacturers are required to provide 50 degree Fahrenheit test results for only three engine families.