Table  4-20M,,,,,,,,,,,,,,,,
Energy Intensity of Passenger Modes,,,,,,,,,,,,,,,,
(Thousand joules per passenger-kilometer),,,,,,,,,,,,,,,,
,,1960,1965,1970,1975,1980,1985,1990,1991,1992,1993,1994,1995,1996,1997,1998
AirR,,,,,,,,,,,,,,,,
Certificated air carrier,,,,,,,,,,,,,,,,
  Domestic operations,,"5,664","6,639","6,682","5,082","3,757","3,311","3,236","3,065","2,994","2,991","2,916","2,875","2,744","2,720","2,705"
  International operations,,"6,036","6,753","7,208","5,554","5,817","3,348","2,983","3,024","2,794","2,689","2,719","2,738","2,695","2,735","2,807"
Highwayb,,,,,,,,,,,,,,,,
Passenger car,,"R2,949","R2,923","R3,176","R3,112","R2,853","R2,800","R2,501","2,397","2,429","2,483","2,474","R2,441","R2,429","R2,399","2,409"
Other 2-axle 4-tire vehicle,,N,N,"R4,468","R4,311","R3,746","R3,261","R2,920","2,806","2,792","2,805","2,851","R2,978","R2,992","R2,994","3,012"
Motorcycle,,a,a,"R1,640","R1,544","R1,394","R1,244","R1,306","1,258","1,306","1,354","1,401","R1,461","R1,476","R1,506","1,529"
Transit motor bus,,N,N,N,N,"R1,799","R2,228","R2,443","2,471","R2,649","R2,588","R2,731","R2,726","R2,753","R2,774","P2,447"
Amtrak,,N,N,N,"R1,563","R1,420","R1,374","1,354","1,298","R1,335","R1,327","1,269","R1,206","R1,409","R1,443","1,403"
a  Included in passenger car.,,,,,,,,,,,,,,,,
b  Energy intensity for highway vehicles may not match similar values in table 4-22 due to rounding error.,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
KEY: N = data do not exist; P = preliminary; R = revised.,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
"NOTE: To calculate total joules multiply fuel consumed by 37,626,700 joules/liter for air carrier and 34,839,537 joules/liter ",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
"for passenger car, other 2-axle 4-tire vehicle, and motorcycle, and 90,999,114 for transit motor bus and Amtrak.",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
SOURCES:,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Air:,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Certificated air carriers:,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Passenger-miles:,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
"1960-99: Air Transport Association, Internet site http://www.air-transport.org/public/industry, as of July 5, 2000.",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Fuel consumed:,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
"1960-99: 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 July 5, 2000.",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
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. ",,,,,,,,,,,,,,,
"1995-98: 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.",,,,,,,,,,,,,,,
"1995-98: 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.",,,,,,,,,,,,,,,
"1990-98: Ibid., Highway Statistics (Washington, DC:  Annual issues), table VM-1.",,,,,,,,,,,,,,,
Transit motor bus:,,,,,,,,,,,,,,,
"1980-98: American Public Transit Association, Public Transportation Fact Book (Washington, DC: 2000), tables 30, 42, and 65.",,,,,,,,,,,,,,,
Amtrak:,,,,,,,,,,,,,,,
"1975-93: Amtrak, State and Local Affairs Department, personal communication.",,,,,,,,,,,,,,,
"1994-98: Ibid., Personal communication, June 25, 1999.",,,,,,,,,,,,,,,