"Table 4-22M:  Energy Intensity of Passenger Cars, Other 2-Axle 4-Tire Vehicles, and Motorcycles",,,,,,,,,,,,,,,,,,,,,,,
,1960,1965,1970,1975,1980,1985,1990,1991,1992,1993,1994,1995,1996,1997,1998,1999,2000,2001,2002,2003,2004,(R) 2005,2006
Vehicle-kilometers (millions),,,,,,,,,,,,,,,,,, ,,,,,
Passenger car,"944,685","1,163,556","1,475,768","1,664,062","1,789,591","2,006,852","2,265,956","2,185,489","2,208,020","2,212,848","2,262,738","2,314,237","2,365,736","2,418,844","2,494,483","2,525,061","2,575,412","2,620,546","2,669,055","2,690,950","2,735,708","2,749,437","2,707,996"
Other 2-axle 4-tire vehicle,N,N,"197,949","323,478","468,319","629,254","925,373","1,044,464","1,137,806","1,200,571","1,231,148","1,271,382","1,314,834","1,369,552","1,396,911","1,450,019","1,485,519","1,517,945","1,554,681","1,583,746","1,653,060","1,675,409","1,752,597"
Motorcycle,b,b,"4,828","9,012","16,415","14,645","15,450","14,806","15,450","15,933","16,415","15,772","15,933","16,254","16,576","17,059","16,848","15,512","15,372","15,413","16,290","16,824","19,957"
Passenger-kilometers (millions)a,,,,,,,,,,,,,,,,,,,,,,,
Passenger car,"1,842,699","2,245,035","2,817,961","3,144,658","3,238,000","3,369,966","3,672,523","3,540,557","3,553,432","3,561,478","3,621,024","3,680,570","3,761,037","3,844,723","3,965,424","4,015,313","4,094,907","4,114,257","4,217,107","4,251,702","4,322,420","4,344,110","4,278,636"
Other 2-axle 4-tire vehicle,N,N,"363,712","584,192","838,468","1,107,229","1,609,344","1,797,637","1,934,431","2,016,508","2,042,258","2,021,336","2,088,929","2,177,442","2,222,504","2,306,190","2,361,976","2,701,852","2,695,316","2,745,707","2,865,873","2,904,621","3,038,437"
Motorcycle,b,b,"4,828","9,656","19,312","19,312","19,312","19,312","19,312","19,312","19,312","17,703","17,703","17,703","17,703","19,312","18,533","18,926","19,523","19,574","20,688","21,367","25,347"
Average occupancy rate,,,,,,,,,,,,,,,,,,,,,,,
Passenger car,1.95,1.93,1.91,1.89,1.81,1.68,1.62,1.62,1.61,1.61,1.60,1.59,1.59,1.59,1.59,1.59,1.59,1.57,1.58,1.58,1.58,1.58,1.58
Other 2-axle 4-tire vehicle,N,N,1.84,1.81,1.79,1.76,1.74,1.72,1.70,1.68,1.66,1.59,1.59,1.59,1.59,1.59,1.59,1.78,1.73,1.73,1.73,1.73,1.73
Motorcycle,b,b,1.00,1.07,1.18,1.32,1.25,1.30,1.25,1.21,1.18,1.12,1.11,1.09,1.07,1.13,1.10,1.22,1.27,1.27,1.27,1.27,1.27
Fuel consumed (million liters),,,,,,,,,,,,,,,,,,,,,,,
Passenger car,"155,849","188,222","256,723","280,650","264,911","270,725","263,344","243,466","247,702","253,804","256,931","257,681","262,030","264,570","271,395","277,406","276,582","278,450","285,690","285,627","285,427","293,063","283,841"
Other 2-axle 4-tire vehicle,N,N,"46,610","72,229","90,078","103,580","134,802","144,667","154,933","162,209","166,982","172,634","179,254","186,954","191,019","200,093","200,395","202,602","209,031","229,994","240,060","222,843","229,631"
Motorcycle,b,b,227,428,772,689,723,697,723,750,776,742,750,765,780,801,793,730,723,725,766,715,833
Energy intensity (Btu/passenger-kilometer)c,,,,,,,,,,,,,,,,,,,,,,,
Passenger car,"2,793","2,768","3,008","2,947","2,702","2,653","2,368","2,271","2,302","2,353","2,343","2,312","2,301","2,272","2,260","2,281","2,230","2,235","2,237","2,218","2,181","2,228","2,191"
Other 2-axle 4-tire vehicle,N,N,"4,232","4,083","3,548","3,089","2,766","2,657","2,645","2,656","2,700","2,820","2,834","2,835","2,838","2,865","2,802","2,476","2,561","2,766","2,766","2,533","2,496"
Motorcycle,a,a,"1,553","1,463","1,320","1,178","1,236","1,191","1,236","1,282","1,327","1,384","1,398","1,426","1,455","1,370","1,412","1,273","1,223","1,223","1,223","1,106","1,085"
KEY: Btu = British thermal unit; N = data do not exist; R = revised.,,,,,,,,,,,,,,,,,,,,,,,
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b Included in passenger car.,,,,,,,,,,,,,,,,,,,,,,,
"c Energy Intensity (Btu/passenger-kilometer) is calculated by converting the fuel consumption in liters to the energy equivalent Btu units and dividing by the passenger-miles.  The heat equivalent factor used for Btu conversion is 33,021.5046605 Btus/liter.",,,,,,,,,,,,,,,,,,,,,,,
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NOTES:  ,,,,,,,,,,,,,,,,,,,,,,,
"In 1995, the U.S. Department of Transportation, Federal Highway Administration revised its vehicle type categories for 1993 and later data. ",,,,,,,,,,,,,,,,,,,,,,,
"These new categories include passenger car, other 2-axle 4-tire vehicle, single-unit 2-axle 6-tire or more truck, and combination truck. ",,,,,,,,,,,,,,,,,,,,,,,
"Other 2-axle 4-tire vehicle includes vans, pickup trucks, and sport utility vehicles.  In previous years, some minivans and sport utility vehicles were included in the passenger car category.  Single-unit 2-axle 6-tire or more trucks are on a single frame with at least 2 axles and 6 tires.  Pre-1993 data have been reassigned to the closest available category.",,,,,,,,,,,,,,,,,,,,,,,
Vehicle-miles and passenger-miles data for 1960 through 1999 have been rounded to the nearest billion miles.,,,,,,,,,,,,,,,,,,,,,,,
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SOURCES:,,,,,,,,,,,,,,,,,,,,
Vehicle-miles:,,,,,,,,,,,,,,,,,,,,
Passenger car:,,,,,,,,,,,,,,,,,,,,
"1960-94: U.S. Department of Transportation, Federal Highway Administration, Highway Statistics Summary to 1995, FHWA-PL-97-009 (Washington, DC: July 1997), table VM-201A.",,,,,,,,,,,,,,,,,,,,
"1995-2006: Ibid., Highway Statistics (Washington, DC: Annual issues), table VM-1.",,,,,,,,,,,,,,,,,,,,
Other 2-axle 4-tire vehicle:,,,,,,,,,,,,,,,,,,,,
"1970-94: Ibid., Highway Statistics, Summary to 1985 (Washington, DC: 1986), table VM-201A.",,,,,,,,,,,,,,,,,,,,
"1995-2006: Ibid., Highway Statistics (Washington, DC: Annual issues), table VM-1.",,,,,,,,,,,,,,,,,,,,
Motorcycle:,,,,,,,,,,,,,,,,,,,,
"1970-94: Ibid., Highway Statistics, Summary to 1985 (Washington, DC: 1986), table VM-201A.",,,,,,,,,,,,,,,,,,,,
"For 1970-94, the unrevised motorcycle vehicle-miles are subtracted from the combined passenger car and motorcycle vehicle-miles from VM-201A.",,,,,,,,,,,,,,,,,,,,
"1995-2006: Ibid., Highway Statistics (Washington, DC: Annual issues), table VM-1.",,,,,,,,,,,,,,,,,,,,
Passenger-miles: ,,,,,,,,,,,,,,,,,,,,
1960-97:  Vehicle-miles multiplied by vehicle occupancy rates.,,,,,,,,,,,,,,,,,,,,
"1998-2006:  Ibid., Highway Statistics (Washington, DC:  Annual issues), table VM-1.",,,,,,,,,,,,,,,,,,,,
Fuel consumed:,,,,,,,,,,,,,,,,,,,,
"1960-94: U.S. Department of Transportation, Federal Highway Administration, Highway Statistics Summary to 1995, FHWA-PL-97-009 (Washington, DC: July 1997), table VM-201A.",,,,,,,,,,,,,,,,,,,,
"For 1970-94, the unrevised motorcycle fuel consumed is subtracted from the combined passenger car and motorcycle fuel consumed from VM-201A.",,,,,,,,,,,,,,,,,,,,
"1995-2006: Ibid., Highway Statistics (Washington, DC: Annual issues), table VM-1.",,,,,,,,,,,,,,,,,,,,
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