|Energy Information Administration Residential Transportation Energy Consumption Survey Channel.  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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                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|EIA 
        Home > Transportation 
        Home Page >**Chapter 1. Introduction**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Chapter 
        1. Introduction
            *Household Vehicles Energy Consumption 
              1994*reports on the results of the 1994 
              Residential Transportation Energy Consumption Survey (RTECS). The 
              RTECS is a national sample survey that has been conducted every 
              3 years since 1985. For the 1994 survey, more than 3,000 households 
              that own or use some 6,000 vehicles provided information to describe 
              vehicle stock, vehicle-miles traveled, energy end-use consumption, 
              and energy expenditures for personal vehicles. The survey results 
              represent the characteristics of the 84.9 million households that 
              used or had access to vehicles in 1994 nationwide. (An additional 
              12 million households neither owned nor had access to vehicles during 
              the survey year.) To be included in the RTECS survey, vehicles must 
              be either owned or used by household members on a regular basis 
              for personal transportation, or owned by a company rather than a 
              household, but kept at home, regularly available for the use of 
              household members. Most vehicles included in the RTECS are classified 
              as "light- duty vehicles" (weighing less than 8,500 pounds). 
              However, the RTECS also includes a very small number of "other" 
              vehicles, such as motor homes and larger trucks that are available 
              for personal use.
            **What 
              Are the Major Findings of the Survey?**
            Members of U.S. households drove 
              more miles and consumed more fuel in 1994 than in 1988. Vehicle-miles 
              traveled per household increased by 13 percent and the average fuel 
              consumption per household increased by 5 percent. Household expenditures 
              for motor gasoline, when adjusted for inflation, rose by 6 percent 
              between 1988 and 1994. Fuel economy, as measured in miles per gallon 
              (mpg), increased by 8 percent over the 6-year period.
            The average number of vehicles per 
              household remained constant between 1988 and 1994 at approximately 
              1.8, while the number of households with vehicles reported in the 
              1988 survey was 81.3 million, compared with 84.9 million in 1994. 
              The total number of vehicles nationwide rose from 148 million to 
              157 million, an increase of 6 percent.
            The composition of the vehicle stock 
              continued its shift away from passenger cars toward minivans and 
              sport-utility vehicles. In 1988, passenger cars comprised nearly 
              three-quarters of the total vehicle stock, but by 1994, that share 
              had dropped to 68 percent. The number of minivans and sport-utility 
              vehicles grew by 42 percent, increasing their share from 5 percent 
              of the total vehicle stock in 1988 to 11 percent in 1994. Pickup 
              trucks made up 18 percent of the vehicle stock in 1994, the same 
              as in 1998. Aside from passenger cars, only large vans decreased 
              in both number and share of total stock, dropping from 3 percent 
              of the total vehicle stock to 2 percent over the 6-year period.
            **What 
              is the Significance of the Findings?**
            The survey results have implications 
              for the overall fuel economy in the United States and the amount 
              of motor gasoline consumed. The increase in the number of minivans, 
              sport-utility vehicles, and pickup trucks may depress overall fleet 
              fuel economy, because these vehicles are subject to the fuel economy 
              standards for light trucks and consume more fuel per mile traveled. 
              Fuel economy is increased, however, by the retirement of older vehicles 
              that are less fuel efficient than newer models. Passenger cars built 
              after 1979 showed a dramatic increase in fuel economy, which rose 
              3 miles per gallon between 1979 and 1980 and then increased steadily--though 
              less dramatically--throughout the 1980's.(1) Fuel economy has leveled off in the 1990's. In 
              1991, 35 million vehicles, or 23 percent of the total vehicle stock, 
              were from model year 1979 or earlier. By 1994, that number had dropped 
              to 20 million, or 13 percent of the vehicle stock. Those older vehicles 
              tend to be driven fewer miles than the new vehicles that replaced 
              them, according to the survey data. Therefore, although older vehicles 
              tend to consume more fuel per mile, their effect on the fleet average 
              is mitigated by the fact that they are driven fewer miles.
            *Household Vehicles Energy Consumption 
              1994* examines the effects of household size, household income, 
              age of primary driver, vehicle characteristics, and Census region 
              on household vehicle stock, miles traveled, fuel economy, and fuel 
              consumption (Table 1.1). In general, the size of the household, 
              composition of the household, and household income had a large effect 
              on those variables.
            **What 
              is the Purpose of the Survey Report?**
            The purpose of this report is to 
              provide information on the use of energy in residential vehicles 
              in the 50 States and the District of Columbia. Included are data 
              about the number and types of vehicles in the residential sector, 
              the characteristics of those vehicles, the total annual vehicle-miles 
              traveled, per-household and per-vehicle vehicle-miles traveled, 
              vehicle fuel consumption and expenditures, and vehicle-fuel economy.
            The Energy Information Administration 
              (EIA) is mandated by Congress to collect, analyze, and disseminate 
              impartial, comprehensive data about energy: how much is produced, 
              who uses it, and the purposes for which it is used. To comply with 
              this mandate, EIA collects energy data from a variety of sources 
              covering a wide range of topics.(2)
            **How Was 
              the Survey Conducted?**
            The data for this report are based 
              on personal interviews and telephone interviews with householders 
              from the 1993 Residential Energy Consumption Survey (RECS) and the 
              1994 RTECS, conducted from 1993 through early 1995. The 1994 RTECS 
              represents 96.6 million households, of which 84.9 million owned 
              or had access to 156.8 million household motor vehicles in the 50 
              States and the District of Columbia.
            The beginning-of-year data collection 
              for the RTECS was combined with the 1993 RECS personal interviews 
              in the fall of 1993. In 1994 and 1995, further data about the vehicle 
              stock and vehicle-miles traveled were collected by telephone interviews. 
              Mail questionnaires were sent to households that could not be contacted 
              by telephone. Mid-year data collection during 1994 was conducted 
              to identify vehicles acquired or disposed of during the first half 
              of the year and to obtain estimated beginning or final odometer 
              readings on those vehicles. The end-of-year data collection was 
              conducted in the first 4 months of 1995. At that time final odometer 
              readings and changes in vehicle stock were collected.
            The survey was used to collect data 
              on actual vehicle-miles traveled for each vehicle in a household 
              by obtaining the odometer reading at two points in time. Vehicle 
              characteristic information (type of vehicle, engine size, number 
              of cylinders, type of fuel system, etc.) was collected directly 
              from respondents and from decoded Vehicle Identification Numbers. 
              Vehicle fuel consumption and expenditures were estimated using vehicle 
              fuel economies as calculated (and adjusted) by the Environmental 
              Protection Agency and presented in miles per gallon and by motor 
              fuel prices collected by the Bureau of Labor Statistics.
            **Are the 
              Survey Results Statistically Significant?**
            Because the statistics published 
              in this report are based on a sample of all residential housing 
              units in the 50 States and the District of Columbia as of November 
              1993, the values are estimates rather than exact measures for the 
              population. Certain estimates in these tables are suppressed due 
              to large error levels or few sample observations. (See table footnotes 
              for explanation.) Each table in the "Detailed Tables" 
              section includes row and column relative standard error (RSE) factors 
              to be used in calculating RSEs for individual table entries.
            Unless stated otherwise, all comparisons 
              reported in the text are statistically significant, based on a standard 
              test made at the 0.05 significance level. These tests were made 
              using the actual RSE's computed by EIA. No adjustments were made 
              for simultaneous inference.
            **Table 
                      1.1. Household Characteristics, Vehicle-Miles Traveled, 
                      Fuel Consumption, and Fuel Expenditures per Household, 1994****Household Characteristics**
                  **Average 
                    Number of Vehicles per Household**
                  **Average 
                    Vehicle-Miles Traveled per Household (thousands)**
                  **Motor 
                    FuelConsumption per Household (gallons)**
                  **Motor 
                    Fuel Expenditures per Household (dollars)****Household Size**1 person
                  1.2
                  11.6
                  566
                  6572 persons
                  1.8
                  20.0
                  1,016
                  1,1713 persons
                  2.1
                  25.2
                  1,257
                  1,4554 persons
                  2.2
                  26.6
                  1,357
                  1,5705 persons
                  2.2
                  26.3
                  1,359
                  1,5716 or more persons
                  2.3
                  30.9
                  1,566
                  1,829**Household Composition**Households with Children
                  2.0
                  24.8
                  1,257
                  1,453Households with No Children
                  1.7
                  18.9
                  951
                  1,100**Family Income**Less than $5,000
                  1.4
                  16.1
                  781
                  923$5,000-$9,999
                  1.2
                  12.2
                  631
                  719$10,000-14,999
                  1.4
                  14.3
                  739
                  854$15,000-19,000
                  1.7
                  17.8
                  937
                  1,073$20,000-24,999
                  1.7
                  18.4
                  931
                  1,079$25,000-34,999
                  1.8
                  21.6
                  1,102
                  1,269$35,000-49,999
                  2.0
                  23.6
                  1,182
                  1,366$50,000-74,999
                  2.3
                  27.0
                  1,325
                  1,528$75,000 or more
                  2.3
                  28.5
                  1,443
                  1,692
            Source: Table 5.2 in this report.
            **How 
              Is This Report Organized?**
            A discussion of the highlights of 
              survey findings, featuring tables and figures that present information 
              of special interest or that provide a finer analysis than is contained 
              in the detailed tables, follows this section. The "Detailed 
              Tables" section that follows the main text contains extensive 
              cross-tabulations of household characteristics, vehicle characteristics, 
              and vehicle fuel consumption and expenditures. Definitions of the 
              terms used in this report are located in the Glossary.
            text box:How Can the Appendices be Obtained A-F
            Thank You . . .
            EIA gratefully acknowledges the 
              cooperation of the respondents in supplying the information used 
              to produce the estimates presented here.
            1.U.S. Department 
              of Transportation, *Summary of Fuel Economy Performance, April 
              1996*, (Washington, DC, April 1996), p. 4.
            2.EIA conducts 
              numerous energy-related surveys. In general, the surveys can be 
              divided into two broad groups: supply surveys, directed to the suppliers 
              and marketers of specific energy sources, that measure the quantities 
              of specific fuels produced for and/or supplied to the market; and 
              consumption surveys, which gather information on the types of energy 
              used by the end users along with the characteristics of those end 
              users that are associated with energy use. The RTECS belongs to 
              the consumption group because it collects information directly from 
              the end user, the household.
            File Last Modified:February 1, 2002
            If you are having any technical 
              problems with this site, please contact the EIA Webmaster at wmaster@eia.doe.gov | Chapter 
        1. Introduction
            *Household Vehicles Energy Consumption 
              1994*reports on the results of the 1994 
              Residential Transportation Energy Consumption Survey (RTECS). The 
              RTECS is a national sample survey that has been conducted every 
              3 years since 1985. For the 1994 survey, more than 3,000 households 
              that own or use some 6,000 vehicles provided information to describe 
              vehicle stock, vehicle-miles traveled, energy end-use consumption, 
              and energy expenditures for personal vehicles. The survey results 
              represent the characteristics of the 84.9 million households that 
              used or had access to vehicles in 1994 nationwide. (An additional 
              12 million households neither owned nor had access to vehicles during 
              the survey year.) To be included in the RTECS survey, vehicles must 
              be either owned or used by household members on a regular basis 
              for personal transportation, or owned by a company rather than a 
              household, but kept at home, regularly available for the use of 
              household members. Most vehicles included in the RTECS are classified 
              as "light- duty vehicles" (weighing less than 8,500 pounds). 
              However, the RTECS also includes a very small number of "other" 
              vehicles, such as motor homes and larger trucks that are available 
              for personal use.
            **What 
              Are the Major Findings of the Survey?**
            Members of U.S. households drove 
              more miles and consumed more fuel in 1994 than in 1988. Vehicle-miles 
              traveled per household increased by 13 percent and the average fuel 
              consumption per household increased by 5 percent. Household expenditures 
              for motor gasoline, when adjusted for inflation, rose by 6 percent 
              between 1988 and 1994. Fuel economy, as measured in miles per gallon 
              (mpg), increased by 8 percent over the 6-year period.
            The average number of vehicles per 
              household remained constant between 1988 and 1994 at approximately 
              1.8, while the number of households with vehicles reported in the 
              1988 survey was 81.3 million, compared with 84.9 million in 1994. 
              The total number of vehicles nationwide rose from 148 million to 
              157 million, an increase of 6 percent.
            The composition of the vehicle stock 
              continued its shift away from passenger cars toward minivans and 
              sport-utility vehicles. In 1988, passenger cars comprised nearly 
              three-quarters of the total vehicle stock, but by 1994, that share 
              had dropped to 68 percent. The number of minivans and sport-utility 
              vehicles grew by 42 percent, increasing their share from 5 percent 
              of the total vehicle stock in 1988 to 11 percent in 1994. Pickup 
              trucks made up 18 percent of the vehicle stock in 1994, the same 
              as in 1998. Aside from passenger cars, only large vans decreased 
              in both number and share of total stock, dropping from 3 percent 
              of the total vehicle stock to 2 percent over the 6-year period.
            **What 
              is the Significance of the Findings?**
            The survey results have implications 
              for the overall fuel economy in the United States and the amount 
              of motor gasoline consumed. The increase in the number of minivans, 
              sport-utility vehicles, and pickup trucks may depress overall fleet 
              fuel economy, because these vehicles are subject to the fuel economy 
              standards for light trucks and consume more fuel per mile traveled. 
              Fuel economy is increased, however, by the retirement of older vehicles 
              that are less fuel efficient than newer models. Passenger cars built 
              after 1979 showed a dramatic increase in fuel economy, which rose 
              3 miles per gallon between 1979 and 1980 and then increased steadily--though 
              less dramatically--throughout the 1980's.(1) Fuel economy has leveled off in the 1990's. In 
              1991, 35 million vehicles, or 23 percent of the total vehicle stock, 
              were from model year 1979 or earlier. By 1994, that number had dropped 
              to 20 million, or 13 percent of the vehicle stock. Those older vehicles 
              tend to be driven fewer miles than the new vehicles that replaced 
              them, according to the survey data. Therefore, although older vehicles 
              tend to consume more fuel per mile, their effect on the fleet average 
              is mitigated by the fact that they are driven fewer miles.
            *Household Vehicles Energy Consumption 
              1994* examines the effects of household size, household income, 
              age of primary driver, vehicle characteristics, and Census region 
              on household vehicle stock, miles traveled, fuel economy, and fuel 
              consumption (Table 1.1). In general, the size of the household, 
              composition of the household, and household income had a large effect 
              on those variables.
            **What 
              is the Purpose of the Survey Report?**
            The purpose of this report is to 
              provide information on the use of energy in residential vehicles 
              in the 50 States and the District of Columbia. Included are data 
              about the number and types of vehicles in the residential sector, 
              the characteristics of those vehicles, the total annual vehicle-miles 
              traveled, per-household and per-vehicle vehicle-miles traveled, 
              vehicle fuel consumption and expenditures, and vehicle-fuel economy.
            The Energy Information Administration 
              (EIA) is mandated by Congress to collect, analyze, and disseminate 
              impartial, comprehensive data about energy: how much is produced, 
              who uses it, and the purposes for which it is used. To comply with 
              this mandate, EIA collects energy data from a variety of sources 
              covering a wide range of topics.(2)
            **How Was 
              the Survey Conducted?**
            The data for this report are based 
              on personal interviews and telephone interviews with householders 
              from the 1993 Residential Energy Consumption Survey (RECS) and the 
              1994 RTECS, conducted from 1993 through early 1995. The 1994 RTECS 
              represents 96.6 million households, of which 84.9 million owned 
              or had access to 156.8 million household motor vehicles in the 50 
              States and the District of Columbia.
            The beginning-of-year data collection 
              for the RTECS was combined with the 1993 RECS personal interviews 
              in the fall of 1993. In 1994 and 1995, further data about the vehicle 
              stock and vehicle-miles traveled were collected by telephone interviews. 
              Mail questionnaires were sent to households that could not be contacted 
              by telephone. Mid-year data collection during 1994 was conducted 
              to identify vehicles acquired or disposed of during the first half 
              of the year and to obtain estimated beginning or final odometer 
              readings on those vehicles. The end-of-year data collection was 
              conducted in the first 4 months of 1995. At that time final odometer 
              readings and changes in vehicle stock were collected.
            The survey was used to collect data 
              on actual vehicle-miles traveled for each vehicle in a household 
              by obtaining the odometer reading at two points in time. Vehicle 
              characteristic information (type of vehicle, engine size, number 
              of cylinders, type of fuel system, etc.) was collected directly 
              from respondents and from decoded Vehicle Identification Numbers. 
              Vehicle fuel consumption and expenditures were estimated using vehicle 
              fuel economies as calculated (and adjusted) by the Environmental 
              Protection Agency and presented in miles per gallon and by motor 
              fuel prices collected by the Bureau of Labor Statistics.
            **Are the 
              Survey Results Statistically Significant?**
            Because the statistics published 
              in this report are based on a sample of all residential housing 
              units in the 50 States and the District of Columbia as of November 
              1993, the values are estimates rather than exact measures for the 
              population. Certain estimates in these tables are suppressed due 
              to large error levels or few sample observations. (See table footnotes 
              for explanation.) Each table in the "Detailed Tables" 
              section includes row and column relative standard error (RSE) factors 
              to be used in calculating RSEs for individual table entries.
            Unless stated otherwise, all comparisons 
              reported in the text are statistically significant, based on a standard 
              test made at the 0.05 significance level. These tests were made 
              using the actual RSE's computed by EIA. No adjustments were made 
              for simultaneous inference.
            **Table 
                      1.1. Household Characteristics, Vehicle-Miles Traveled, 
                      Fuel Consumption, and Fuel Expenditures per Household, 1994****Household Characteristics**
                  **Average 
                    Number of Vehicles per Household**
                  **Average 
                    Vehicle-Miles Traveled per Household (thousands)**
                  **Motor 
                    FuelConsumption per Household (gallons)**
                  **Motor 
                    Fuel Expenditures per Household (dollars)****Household Size**1 person
                  1.2
                  11.6
                  566
                  6572 persons
                  1.8
                  20.0
                  1,016
                  1,1713 persons
                  2.1
                  25.2
                  1,257
                  1,4554 persons
                  2.2
                  26.6
                  1,357
                  1,5705 persons
                  2.2
                  26.3
                  1,359
                  1,5716 or more persons
                  2.3
                  30.9
                  1,566
                  1,829**Household Composition**Households with Children
                  2.0
                  24.8
                  1,257
                  1,453Households with No Children
                  1.7
                  18.9
                  951
                  1,100**Family Income**Less than $5,000
                  1.4
                  16.1
                  781
                  923$5,000-$9,999
                  1.2
                  12.2
                  631
                  719$10,000-14,999
                  1.4
                  14.3
                  739
                  854$15,000-19,000
                  1.7
                  17.8
                  937
                  1,073$20,000-24,999
                  1.7
                  18.4
                  931
                  1,079$25,000-34,999
                  1.8
                  21.6
                  1,102
                  1,269$35,000-49,999
                  2.0
                  23.6
                  1,182
                  1,366$50,000-74,999
                  2.3
                  27.0
                  1,325
                  1,528$75,000 or more
                  2.3
                  28.5
                  1,443
                  1,692
            Source: Table 5.2 in this report.
            **How 
              Is This Report Organized?**
            A discussion of the highlights of 
              survey findings, featuring tables and figures that present information 
              of special interest or that provide a finer analysis than is contained 
              in the detailed tables, follows this section. The "Detailed 
              Tables" section that follows the main text contains extensive 
              cross-tabulations of household characteristics, vehicle characteristics, 
              and vehicle fuel consumption and expenditures. Definitions of the 
              terms used in this report are located in the Glossary.
            text box:How Can the Appendices be Obtained A-F
            Thank You . . .
            EIA gratefully acknowledges the 
              cooperation of the respondents in supplying the information used 
              to produce the estimates presented here.
            1.U.S. Department 
              of Transportation, *Summary of Fuel Economy Performance, April 
              1996*, (Washington, DC, April 1996), p. 4.
            2.EIA conducts 
              numerous energy-related surveys. In general, the surveys can be 
              divided into two broad groups: supply surveys, directed to the suppliers 
              and marketers of specific energy sources, that measure the quantities 
              of specific fuels produced for and/or supplied to the market; and 
              consumption surveys, which gather information on the types of energy 
              used by the end users along with the characteristics of those end 
              users that are associated with energy use. The RTECS belongs to 
              the consumption group because it collects information directly from 
              the end user, the household.
            File Last Modified:February 1, 2002
            If you are having any technical 
              problems with this site, please contact the EIA Webmaster at wmaster@eia.doe.gov
|Chapter 
        1. Introduction
            *Household Vehicles Energy Consumption 
              1994*reports on the results of the 1994 
              Residential Transportation Energy Consumption Survey (RTECS). The 
              RTECS is a national sample survey that has been conducted every 
              3 years since 1985. For the 1994 survey, more than 3,000 households 
              that own or use some 6,000 vehicles provided information to describe 
              vehicle stock, vehicle-miles traveled, energy end-use consumption, 
              and energy expenditures for personal vehicles. The survey results 
              represent the characteristics of the 84.9 million households that 
              used or had access to vehicles in 1994 nationwide. (An additional 
              12 million households neither owned nor had access to vehicles during 
              the survey year.) To be included in the RTECS survey, vehicles must 
              be either owned or used by household members on a regular basis 
              for personal transportation, or owned by a company rather than a 
              household, but kept at home, regularly available for the use of 
              household members. Most vehicles included in the RTECS are classified 
              as "light- duty vehicles" (weighing less than 8,500 pounds). 
              However, the RTECS also includes a very small number of "other" 
              vehicles, such as motor homes and larger trucks that are available 
              for personal use.
            **What 
              Are the Major Findings of the Survey?**
            Members of U.S. households drove 
              more miles and consumed more fuel in 1994 than in 1988. Vehicle-miles 
              traveled per household increased by 13 percent and the average fuel 
              consumption per household increased by 5 percent. Household expenditures 
              for motor gasoline, when adjusted for inflation, rose by 6 percent 
              between 1988 and 1994. Fuel economy, as measured in miles per gallon 
              (mpg), increased by 8 percent over the 6-year period.
            The average number of vehicles per 
              household remained constant between 1988 and 1994 at approximately 
              1.8, while the number of households with vehicles reported in the 
              1988 survey was 81.3 million, compared with 84.9 million in 1994. 
              The total number of vehicles nationwide rose from 148 million to 
              157 million, an increase of 6 percent.
            The composition of the vehicle stock 
              continued its shift away from passenger cars toward minivans and 
              sport-utility vehicles. In 1988, passenger cars comprised nearly 
              three-quarters of the total vehicle stock, but by 1994, that share 
              had dropped to 68 percent. The number of minivans and sport-utility 
              vehicles grew by 42 percent, increasing their share from 5 percent 
              of the total vehicle stock in 1988 to 11 percent in 1994. Pickup 
              trucks made up 18 percent of the vehicle stock in 1994, the same 
              as in 1998. Aside from passenger cars, only large vans decreased 
              in both number and share of total stock, dropping from 3 percent 
              of the total vehicle stock to 2 percent over the 6-year period.
            **What 
              is the Significance of the Findings?**
            The survey results have implications 
              for the overall fuel economy in the United States and the amount 
              of motor gasoline consumed. The increase in the number of minivans, 
              sport-utility vehicles, and pickup trucks may depress overall fleet 
              fuel economy, because these vehicles are subject to the fuel economy 
              standards for light trucks and consume more fuel per mile traveled. 
              Fuel economy is increased, however, by the retirement of older vehicles 
              that are less fuel efficient than newer models. Passenger cars built 
              after 1979 showed a dramatic increase in fuel economy, which rose 
              3 miles per gallon between 1979 and 1980 and then increased steadily--though 
              less dramatically--throughout the 1980's.(1) Fuel economy has leveled off in the 1990's. In 
              1991, 35 million vehicles, or 23 percent of the total vehicle stock, 
              were from model year 1979 or earlier. By 1994, that number had dropped 
              to 20 million, or 13 percent of the vehicle stock. Those older vehicles 
              tend to be driven fewer miles than the new vehicles that replaced 
              them, according to the survey data. Therefore, although older vehicles 
              tend to consume more fuel per mile, their effect on the fleet average 
              is mitigated by the fact that they are driven fewer miles.
            *Household Vehicles Energy Consumption 
              1994* examines the effects of household size, household income, 
              age of primary driver, vehicle characteristics, and Census region 
              on household vehicle stock, miles traveled, fuel economy, and fuel 
              consumption (Table 1.1). In general, the size of the household, 
              composition of the household, and household income had a large effect 
              on those variables.
            **What 
              is the Purpose of the Survey Report?**
            The purpose of this report is to 
              provide information on the use of energy in residential vehicles 
              in the 50 States and the District of Columbia. Included are data 
              about the number and types of vehicles in the residential sector, 
              the characteristics of those vehicles, the total annual vehicle-miles 
              traveled, per-household and per-vehicle vehicle-miles traveled, 
              vehicle fuel consumption and expenditures, and vehicle-fuel economy.
            The Energy Information Administration 
              (EIA) is mandated by Congress to collect, analyze, and disseminate 
              impartial, comprehensive data about energy: how much is produced, 
              who uses it, and the purposes for which it is used. To comply with 
              this mandate, EIA collects energy data from a variety of sources 
              covering a wide range of topics.(2)
            **How Was 
              the Survey Conducted?**
            The data for this report are based 
              on personal interviews and telephone interviews with householders 
              from the 1993 Residential Energy Consumption Survey (RECS) and the 
              1994 RTECS, conducted from 1993 through early 1995. The 1994 RTECS 
              represents 96.6 million households, of which 84.9 million owned 
              or had access to 156.8 million household motor vehicles in the 50 
              States and the District of Columbia.
            The beginning-of-year data collection 
              for the RTECS was combined with the 1993 RECS personal interviews 
              in the fall of 1993. In 1994 and 1995, further data about the vehicle 
              stock and vehicle-miles traveled were collected by telephone interviews. 
              Mail questionnaires were sent to households that could not be contacted 
              by telephone. Mid-year data collection during 1994 was conducted 
              to identify vehicles acquired or disposed of during the first half 
              of the year and to obtain estimated beginning or final odometer 
              readings on those vehicles. The end-of-year data collection was 
              conducted in the first 4 months of 1995. At that time final odometer 
              readings and changes in vehicle stock were collected.
            The survey was used to collect data 
              on actual vehicle-miles traveled for each vehicle in a household 
              by obtaining the odometer reading at two points in time. Vehicle 
              characteristic information (type of vehicle, engine size, number 
              of cylinders, type of fuel system, etc.) was collected directly 
              from respondents and from decoded Vehicle Identification Numbers. 
              Vehicle fuel consumption and expenditures were estimated using vehicle 
              fuel economies as calculated (and adjusted) by the Environmental 
              Protection Agency and presented in miles per gallon and by motor 
              fuel prices collected by the Bureau of Labor Statistics.
            **Are the 
              Survey Results Statistically Significant?**
            Because the statistics published 
              in this report are based on a sample of all residential housing 
              units in the 50 States and the District of Columbia as of November 
              1993, the values are estimates rather than exact measures for the 
              population. Certain estimates in these tables are suppressed due 
              to large error levels or few sample observations. (See table footnotes 
              for explanation.) Each table in the "Detailed Tables" 
              section includes row and column relative standard error (RSE) factors 
              to be used in calculating RSEs for individual table entries.
            Unless stated otherwise, all comparisons 
              reported in the text are statistically significant, based on a standard 
              test made at the 0.05 significance level. These tests were made 
              using the actual RSE's computed by EIA. No adjustments were made 
              for simultaneous inference.
            **Table 
                      1.1. Household Characteristics, Vehicle-Miles Traveled, 
                      Fuel Consumption, and Fuel Expenditures per Household, 1994****Household Characteristics**
                  **Average 
                    Number of Vehicles per Household**
                  **Average 
                    Vehicle-Miles Traveled per Household (thousands)**
                  **Motor 
                    FuelConsumption per Household (gallons)**
                  **Motor 
                    Fuel Expenditures per Household (dollars)****Household Size**1 person
                  1.2
                  11.6
                  566
                  6572 persons
                  1.8
                  20.0
                  1,016
                  1,1713 persons
                  2.1
                  25.2
                  1,257
                  1,4554 persons
                  2.2
                  26.6
                  1,357
                  1,5705 persons
                  2.2
                  26.3
                  1,359
                  1,5716 or more persons
                  2.3
                  30.9
                  1,566
                  1,829**Household Composition**Households with Children
                  2.0
                  24.8
                  1,257
                  1,453Households with No Children
                  1.7
                  18.9
                  951
                  1,100**Family Income**Less than $5,000
                  1.4
                  16.1
                  781
                  923$5,000-$9,999
                  1.2
                  12.2
                  631
                  719$10,000-14,999
                  1.4
                  14.3
                  739
                  854$15,000-19,000
                  1.7
                  17.8
                  937
                  1,073$20,000-24,999
                  1.7
                  18.4
                  931
                  1,079$25,000-34,999
                  1.8
                  21.6
                  1,102
                  1,269$35,000-49,999
                  2.0
                  23.6
                  1,182
                  1,366$50,000-74,999
                  2.3
                  27.0
                  1,325
                  1,528$75,000 or more
                  2.3
                  28.5
                  1,443
                  1,692
            Source: Table 5.2 in this report.
            **How 
              Is This Report Organized?**
            A discussion of the highlights of 
              survey findings, featuring tables and figures that present information 
              of special interest or that provide a finer analysis than is contained 
              in the detailed tables, follows this section. The "Detailed 
              Tables" section that follows the main text contains extensive 
              cross-tabulations of household characteristics, vehicle characteristics, 
              and vehicle fuel consumption and expenditures. Definitions of the 
              terms used in this report are located in the Glossary.
            text box:How Can the Appendices be Obtained A-F
            Thank You . . .
            EIA gratefully acknowledges the 
              cooperation of the respondents in supplying the information used 
              to produce the estimates presented here.
            1.U.S. Department 
              of Transportation, *Summary of Fuel Economy Performance, April 
              1996*, (Washington, DC, April 1996), p. 4.
            2.EIA conducts 
              numerous energy-related surveys. In general, the surveys can be 
              divided into two broad groups: supply surveys, directed to the suppliers 
              and marketers of specific energy sources, that measure the quantities 
              of specific fuels produced for and/or supplied to the market; and 
              consumption surveys, which gather information on the types of energy 
              used by the end users along with the characteristics of those end 
              users that are associated with energy use. The RTECS belongs to 
              the consumption group because it collects information directly from 
              the end user, the household.
            File Last Modified:February 1, 2002
            If you are having any technical 
              problems with this site, please contact the EIA Webmaster at wmaster@eia.doe.gov |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|2 persons                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | 1.8                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|3 persons                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          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