Estimated U.S. Average Vehicle Emissions Rates per Vehicle by Vehicle Type Using Gasoline, Diesel, and Electric

KEY: Btu = British thermal unit; CO = carbon monoxide; CO2 = carbon dioxide; HC=hydrocarbons; N = data do not exist; NOx= nitrogen oxides; P = projection; PM2.5 = particulate matter with diameter <=2.5 micrometers; R = revised.

^a Total HC includes exhaust and evaporative emissions.

^b Motorcycle emission rates were last analyzed in 2010.

^c For electric vehicles, total HC and exhaust CO, NOx, PM2.5 and CO2 g/mile values are zero.

Federal Exhaust Emissions Standards for Locomotives

KEY: bhp-hr = brake horsepower-hour; CO = carbon monoxide; g = gram; HC = hydrocarbon; NOx = nitrogen oxides; PM = particulate matter; hp = horsepower; U = data are not available. 

^a Standards apply to locomotives that are propelled by engines with total rated horsepower (hp) of 750 kilowatts (kW) (1006 hp) or more, unless the owner chooses to have the equipment certified to meet the requirements of locomotives. This does not include vehicles propelled by engines with total rated horsepower of less than 750 kW (1006 hp); see the requirements in 40 Code of Federal...

Energy Intensity of Passenger Modes (Metric)

KEY: Btu = British thermal unit; N = data does not exist; R = revised; 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 Other...

U.S. Government Energy Consumption by Agency and Source (Metric)

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.

Annual Wasted Fuel Due to Congestion

KEY: NA = not applicable; R = revised.

Very large urban areas - over 3 million population.

Large urban areas - over 1 million and less than 3 million population.

Medium urban areas - over 500,000 and less than 1 million population.

Small urban areas - less than 500,000 population.

^a Percent changes were calculated using the numbers in this table and were not obtained from the source. Ranks are based on the calculated percent changes with the highest number corresponding to a rank of 1.

Energy Intensity of Amtrak Services

KEY:  Btu = British thermal unit; kWh = kilowatt hour.

^a Revenue passenger-miles data prior to 2001 are fiscal year data; 2001 data and more recent data are calendar year data.

^b Includes electric power generation and distribution losses.

^cElectric usage and diesel usage data are calendar year data.

Energy Intensity of Amtrak Services

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.

Energy Intensity of Class I Railroad Freight Service

KEY:  Btu = British thermal unit.

Energy Intensity of Transit Motor Buses

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.

Average Fuel Efficiency of U.S. Light Duty Vehicles

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...