|Passenger-miles of travel (billions)||3,925||3,996||4,082||4,120||4,247||4,376||4,497||4,620||4,733||4,916||4,967|
|Energy use (trillions of Btu)||14,668||15,123||15,404||15,631||16,033||16,399||16,787||17,416||17,387||17,437||17,735|
|Energy efficiency (pmt/thousand Btu)||0.268||0.264||0.265||0.264||0.265||0.267||0.268||0.265||0.272||0.282||0.280|
KEY: Btu = British thermal units; pmt = passenger-miles of travel.
NOTES: Pmt is the sum of pmt for certificated air carriers (domestic), passenger cars, motorcycles, light trucks (other 2-axle, 4-tire vehicles), buses, transit (excluding bus), and intercity/Amtrak rail. Energy consumption is the sum of usage by commercial aviation (passenger), gasoline fuel (passenger cars, light trucks, and buses), and Amtrak (which includes electricity and distillate/diesel fuels). Passenger commercial domestic aviation fuel consumption data were estimated from total commercial domestic aviation fuel consumption data. General aviation data were excluded because passenger and freight operations data cannot be disaggregated.
SOURCES: Pmt and energy use (except transit)—U.S. Department of Transportation (USDOT), Research and Innovative Technology Administration, Bureau of Transportation Statistics (BTS), calculations based on USDOT, BTS, National Transportation Statistics 2004, tables 1-34, 4-6, and 4-8, available at http://www.bts.gov/, as of March 2005. Transit energy use—American Public Transportation Association, Public Transportation Fact Book 2005 (Washington, DC: 2005), tables 34 and 35.