"Table 4-22 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
Vehicle-miles (millions),,,,,,,,,,,,,,,
Passenger car,"587,000","723,000","917,000","1,034,000","1,112,000","1,247,000","1,408,000","1,358,000","1,372,000","1,375,000","1,406,000","1,438,000","1,470,000","R1,503,000","1,546,000"
Other 2-axle 4-tire vehicle,N,N,"123,000","201,000","291,000","391,000","575,000","649,000","707,000","746,000","765,000","790,000","817,000","R851,000","866,000"
Motorcycle,b,b,"3,000","5,600","10,200","9,100","9,600","9,200","9,600","9,900","10,200","9,800","9,900","10,100","10,300"
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Passenger-miles (millions)a,,,,,,,,,,,,,,,
Passenger car,"1,145,000","1,395,000","1,751,000","1,954,000","2,012,000","2,094,000","2,282,000","2,200,000","2,208,000","2,213,000","2,250,000","R2,287,000","2,337,000","R2,389,000","2,458,000"
Other 2-axle 4-tire vehicle,N,N,"226,000","363,000","521,000","688,000","1,000,000","1,117,000","1,202,000","1,253,000","1,269,000","R1,256,000","R1,298,000","R1,353,000","1,377,000"
Motorcycle,b,b,"3,000","6,000","12,000","12,000","12,000","12,000","12,000","12,000","12,000","R11,000","R11,000","R11,000","11,000"
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Fuel consumed (million gallons),,,,,,,,,,,,,,,
Passenger car,"41,171","49,723","67,819","74,140","69,982","71,518","69,568","64,317","65,436","67,048","67,874","68,072","69,221","R69,892","72,209"
Other 2-axle 4-tire vehicle,N,N,"12,313","19,081","23,796","27,363","35,611","38,217","40,929","42,851","44,112","45,605","47,354","R49,388","50,579"
Motorcycle,b,b,60,113,204,182,191,184,191,198,205,196,198,202,205
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Energy intensity (BTU/passenger-mile),,,,,,,,,,,,,,,
Passenger car,"4,495","4,455","4,841","4,743","4,348","4,269","3,811","3,654","3,704","3,787","3,771","3,721","3,702","3,657","3,672"
Other 2-axle 4-tire vehicle,N,N,"6,810","6,571","5,709","4,971","4,451","4,277","4,256","4,275","4,345","4,539","4,560","4,563","4,591"
Motorcycle,a,a,"2,500","2,354","2,125","1,896","1,990","1,917","1,990","2,063","2,135","2,227","2,250","2,295","2,330"
"a  Passenger-miles are derived by multiplying vehicle-miles by an average occupancy rate for that vehicle type based on data provided by the Federal Highway Administration, Nationwide Personal ",,,,,,,,,,,,,,,
"Transportation Survey, 1977, 1983, 1995. Average vehicle occupancy rates are as follows:",,,,,,,,,,,,,,,
"passenger car (1960-97): 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; ",,,,,,,,,,,,,,,
"other 2-axle 4-tire vehicle (1960-97): 1.87, 1.85, 1.83, 1.81, 1.79, 1.76, 1.74, 1.72, 1.70, 1.68, 1.66, 1.64, 1.64, 1.64;",,,,,,,,,,,,,,,
"motorcycle (1960-97): 1.1, 1.1, 1.1, 1.1, 1.2, 1.3, 1.3, 1.27, 1.25, 1.23, 1.21, 1.18, 1.18, 1.18. ",,,,,,,,,,,,,,,
b Included in passenger car.,,,,,,,,,,,,,,,
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KEY: Btu = British thermal unit; N = data do not exist; R = revised.,,,,,,,,,,,,,,,
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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.,,,,,,,,,,,,,,
,,,,,,,,,,,,,,
"The heat equivalent factor used for Btu conversion is 125,000 Btus/gallon.",,,,,,,,,,,,,,
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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.",,,,,,,,,,,,,,
"1995-98: Ibid., Highway Statistics (Washington, DC: Annual issues), table VM-1.",,,,,,,,,,,,,,
Other 2-axle 4-tire vehicle:,,,,,,,,,,,,,,
"1960-94: Ibid., Highway Statistics, Summary to 1995, FHWA-PL-97-009 (Washington, DC: July 1997), table VM-201A.",,,,,,,,,,,,,,
"1995-98: Ibid., Highway Statistics (Washington, DC: Annual issues), table VM-1.",,,,,,,,,,,,,,
Motorcycle:,,,,,,,,,,,,,,
"1970-85: 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.",,,,,,,,,,,,,,
"1990-98 Ibid., Highway Statistics (Washington, DC: Annual issues), table VM-1.",,,,,,,,,,,,,,
Passenger-miles:  Passenger-miles multiplied by vehicle occupancy rates.,,,,,,,,,,,,,,
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.",,,,,,,,,,,,,,
"1995-98: Ibid. Highway Statistics (Washington, DC: Annual issues), table VM-1.",,,,,,,,,,,,,,