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KEY: Btu = British thermal unit; kWh = kilowatt hour; R = revised.
aRevenue passenger-miles data prior to 2001 are fiscal year data; 2001 data and more recent data are calendar year data.
b Does not include electric power generation and distribution losses, which, if included, would triple the electric conversion factor given below and increase the numbers in this row by about 20 percent.
cElectric usage and diesel usage data are calendar year data.
KEY: Btu = British thermal unit.
KEY: Btu = British thermal unit; KWH = Kilowatt hour; N = data do not exist.
a Before 2002, Other major fuels includes liquefied petroleum gas, methanol, ethanol, and bunker fuel. From 2002 - 13, Other major fuels includes liquefied petroleum gas, methanol, ethanol, bunker fuel, kerosene, and grain additive. After 2013, other major fuels includes liquefied petroleum gas, ethanol and hydrogen.
b Power includes electric propulsion and electric battery.
KEY: CAFE = Corporate Average Fuel Economy; GVWR = gross vehicle weight rating; mpg = miles per gallon; U = data are not available.
a Data from 2007 were calculated using a new methodology developed by FHWA. Data for these years are based on new categories and are not comparable to previous years. The new category Light duty vehicle, short wheel base replaces the old category Passenger car and includes passenger cars, light trucks, vans and sport utility vehicles with a wheelbase (WB) equal to or less than 121 inches. The new category Light...
KEY: Btu = British thermal unit; N = data do not exist; U = data are not available.
aMotorcycle is included in Light duty vehicle, short wheel base (previously Passenger car) in 1960 and 1965.
b Energy Intensity (Btu/passenger-mile) is calculated by converting the fuel consumption in gallons to the energy equivalent Btu units and dividing by the passenger-miles. The heat equivalent factor used for Btu conversion is 125,000 Btus/gallon.
KEY: Btu = British thermal unit; R = revised.
a U.S. owned carriers only. Operations of foreign-owned carriers in or out of the United States not included.
KEY: Btu = British thermal unit; N = data do not exist; U = data are not available.
a Data from 2007 were calculated using a new methodology developed by FHWA. Data for these years are based on new categories and are not comparable to previous years. The new category Light duty vehicle, short wheel base replaces the old category Passenger car and includes passenger cars, light trucks, vans and sport utility vehicles with a wheelbase (WB) equal to or less than 121 inches. The new category Light duty vehicle, long wheel base replaces...
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.