Table 4-20:  Energy Intensity of Passenger Modes (Btu per passenger-mile),,,,,,,,,,,,,,,,,,,,
,1960,1965,1970,1975,1980,1985,1990,1991,1992,1993,1994,1995,1996,1997,1998,1999,2000,2001,2002,2003
"Air, certificated carrier",,,,,,,,,,,,,,,,,,,,
Domestic operations,"8,633","10,118","10,185","7,746","5,742","5,047","4,932","4,671","4,564","4,558","4,444","4,382","4,183","4,166","4,123","4,049","3,883","(R) 3,890","3,596","3,476"
International operations,"9,199","10,292","10,986","8,465","4,339","5,103","4,546","4,609","4,258","4,099","4,145","4,173","4,108","4,168","4,278","4,123","3,833","(R) 3,965","3,920","3,894"
Highwaya,,,,,,,,,,,,,,,,,,,,
Passenger car,"4,495","4,455","4,841","4,743","4,348","4,269","3,811","3,654","3,703","3,785","3,771","3,721","3,688","3,657","3,637","3,672","3,589","(R) 3,597","3,600","3,553"
Other 2-axle 4-tire vehicle,N,N,"6,810","6,571","5,709","4,971","4,539","4,277","4,256","4,275","4,345","4,538","4,541","4,564","4,569","4,612","4,509","(R) 3,985","4,121","4,068"
Motorcycle,b,b,"2,500","2,354","2,125","1,896","2,227","1,917","1,990","2,063","2,135","2,274","2,271","2,273","2,273","2,273","2,273","(R) 2,049","1,969","1,969"
Transit motor bus,N,N,N,N,"2,742","3,389","3,723","3,767","4,038","3,944","4,162","4,155","4,196","4,228","4,133","4,044","4,147","3,697","4,415",U
Amtrak,N,N,N,"2,383","2,148","2,089","2,066","1,978","2,035","2,023","1,935","1,838","2,153","2,200","2,138","2,107","2,134","2,100",U,U
KEY: Btu = British thermal unit; N = data do not exist; R = revised; U = data are not available.,,,,,,,,,,,,,,,,,,,,
"a  For 1995 and subsequent years, highway passenger-miles were taken directly from Highway Statistics rather than derived from vehicle-miles and average occupancy, as is the case for 1960-1994.",,,,,,,,,,,,,,,,,,,,
b  Included in passenger car.,,,,,,,,,,,,,,,,,,,,
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NOTE,,,,,,,,,,,,,,,,,,,,
"To calculate total Btu, multiply fuel consumed (see tables 4-21, 4-22, 4-24, 4-25) by 135,000 Btu/gallon for air carrier; 125,000 Btu/gallon for passenger car, other 2-axle 4-tire vehicle, and motorcycle; 138,700 Btu/gallon for transit motor bus and Amtrak diesel consumption; and 3,412 Btu/KwH for Amtrak electric consumption.",,,,,,,,,,,,,,,,,,,,,,,,,,,,,
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SOURCES,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Air:,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Certificated air carriers:,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Passenger-miles:,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
"Air Transport Association, Internet site http://www.airlines.org as of Aug. 30, 2004.",,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Fuel consumed:,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
"U.S. Department of Transportation, Bureau of Transportation Statistics, Office of Airline Information, Internet site http://www.bts.gov/oai/fuel/fuelyearly.html as of Aug. 30, 2004.",,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Highway:,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
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. ",,,,,,,,,,,,,,,,,,,,,,,,,,,,,
"1995-2003: Ibid., Highway Statistics (Washington, DC: Annual issues), table VM-1.",,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Other 2-axle 4-tire vehicle:,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
"1970-94: Ibid., Highway Statistics Summary to 1995, FHWA-PL-97-009 (Washington, DC: July 1997), table VM-201A.",,,,,,,,,,,,,,,,,,,,,,,,,,,,,
"1995-2003: Ibid., Highway Statistics (Washington, DC: Annual issues), table VM-1.",,,,,,,,,,,,,,
Motorcycle:,,,,,,,,,,,,,,
"1970-85: Ibid., Highway Statistics Summary to 1985, FHWA-PL-97-009 (Washington, DC:  July 1997), table VM-201A.",,,,,,,,,,,,,,
"1990-2003: Ibid., Highway Statistics (Washington, DC: Annual issues), table VM-1.",,,,,,,,,,,,,,
Transit motor bus:,,,,,,,,,,,,,,
"American Public Transportation Association, Public Transportation Fact Book (Washington, DC: 2004), table 70.",,,,,,,,,,,,,,
Amtrak:,,,,,,,,,,,,,,
"Amtrak, State and Local Affairs Department, personal communication.",,,,,,,,,,,,,,
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