Table 4-20:  Energy Intensity of Passenger Modes (Btu per passenger-mile),,,,,,,,,,,,,,,,,,,,,,
,1960,1965,1970,1975,1980,1985,1990,1991,1992,1993,1994,1995,1996,1997,1998,1999,2000,2001,2002,2003,2004,2005
"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","3,890","3,596","3,463","3,297","3,182"
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","3,965","3,920","3,872","3,428","3,523"
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","3,597","3,600","3,570","(R) 3,509","3,458"
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","3,985","4,121","4,452","(R) 4,452","4,452"
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","2,049","1,969","1,969","(R) 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","3,698","3,550","3,514","3,572","3,393"
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,U,U
KEY: Btu = British thermal unit; N = data do not exist; P = revised; R = revised; U = data are not available.,,,,,,,,,,,,,,,,,,,,,,
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"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:,,,,,,,,,,,,,,,,,,,,,,,,,,
"1960-80: Air Transport Association, Internet site http://www.airlines.org as of Aug. 30, 2004.",,,,,,,,,,,,,,,,,,,,,,,,,,
"1985-2005: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, Office of Airline Information, Air Carrier Traffic Statistics (Washington DC: Annual December issues).",,,,,,,,,,,,,,,,,,,,,,,,,,
Fuel consumed:,,,,,,,,,,,,,,,,,,,,,,,,,,
"U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, Office of Airline Information, Internet site http://www.bts.gov/oai/fuel/fuelyearly.html as of Apr. 25, 2007.",,,,,,,,,,,,,,,,,,,,,,,,,,
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. ",,,,,,,,,,,,,,,,,,,,,,,,,,
"1995-2005: 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.",,,,,,,,,,,,,,
"1995-2005: 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.",,,,,,,,,,,,,,
"1990-2005: Ibid., Highway Statistics (Washington, DC: Annual issues), table VM-1.",,,,,,,,,,,,,,
Transit motor bus:,,,,,,,,,,,,,,
"American Public Transportation Association, 2006 Public Transportation Fact Book (Washington, DC: Annual issues), tables 10 and 27, and similar tables in earlier editions.",,,,,,,,,,,,,,
Amtrak:,,,,,,,,,,,,,,
"Amtrak, State and Local Affairs Department, personal communication.",,,,,,,,,,,,,,
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