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KEY: Btu = British thermal unit; DHS = Department of Homeland Security; FY = fiscal year; GSA = General Services Administration; N = data do not exist; NASA = National Aeronautics and Space Administration; R = revised.
a Includes all U.S. government agencies not separately displayed. See http://ctsedwweb.ee.doe.gov/Annual/Report/AgencyReference.aspx for agency list.
b Includes liquefied petroleum gas and Navy special fuel oil.
a Age is based on the year the vessel was built or rebuilt.
b In 1992, Offshore support boats were designated as crew boats.
c In 1992, Tank barges were designated as Liquid barges.
KEY: N = data do not exist.
a Year-end daily average. Active units less backshop units undergoing heavy maintenance less back-ordered units undergoing progressive maintenance and running repairs.
b Fiscal Year-end average. Fiscal Year ends Sept. 30th of stated year. Since 2001, only passenger car data are included in the Passenger and other train cars category.
KEY: N = data do not exist; U = data are unavailable.
a For 1960-80, the total includes a small number of steam and electric units, which are not included in the per locomotive fuel consumption figure.
b United States owners only. Includes cars owned by Class I railroads, other railroads, car companies, and shippers.
c Based on the distance run between terminals and/or stations; does not include yard or passenger train-miles.
d Excludes passenger and work trains.
KEY: kWh = kilowatt hour; N = data do not exist.
a Prior to 1984, the data in this table include the energy consumption of bus, heavy rail, light rail and trolley bus. Commuter rail, automated guideway, urban ferryboat, demand responsive vehicles, and most rural and smaller systems are excluded from the data during this period.
b 1960 to 1991 data include propane. Series not continuous between 1991 and 1992. 1992 to 1995 data include propane, liquefied natural gas, bio/soy fuel, biodiesel, hydrogen, methanol and ethanol,...
a Beginning in 1998, the Federal Highway Administration (FHWA) used the Census Bureau's 1997 Vehicle Inventory and Use Survey (VIUS) for its baseline estimate of single-unit 2-axle 6-tire or more trucks. Prior to 1998, the FHWA used the Census Bureau's 1992 Transportation Inventory and Use Survey (TIUS) for its baseline estimates. Therefore, post-1997 data may not be comparable to 1997 and earlier years.
KEY: U = data are unavailable.
a 1960-1994 data include Motorcycles.