Index: 1990 = 1.00
|Energy efficiency (PM/BTU)||1.00||1.04||1.03||1.02||1.02||1.01||1.02||1.03||1.03||1.02||1.05|
KEY: BTU = British thermal unit; PM = passenger-miles.
NOTES: General aviation data are excluded because passenger and freight operations data cannot be disaggregated. Transit bus data are excluded because those operations are included in highway bus data. Commercial domestic aviation fuel consumption data for passenger and freight operations were estimated from the total commercial domestic aviation fuel consumption.
SOURCES: Passenger-miles and energy use (unless otherwise noted)-U.S. Department of Transportation, Bureau of Transportation Statistics, National Transportation Statistics 2002 (Washington, DC: 2002), tables 1-34, 4-6, and 4-8, available at http://www.bts.gov/, as of May 2003. Transit energy use calculated from-American Public Transportation Association, Transit Statistics, tables 30 and 33, available at http://www.apta.com, as of May 2003.