Key: R = revised.
Notes: Fuel economy is miles divided by gallons. Whenever there are more than one fuel economy values, dividing the total miles traveled by the total gallons consumed provides the average fuel economy.
Average fuel economy data for light trucks in 2006 and cars in 2007 have been revised.
Source: U.S. Environmental Protection Agency, Light-Duty Automotive Technology and Fuel Economy Trends: 1975 Through 2008, Table A-2, available at http://www.epa.gov/otaq/fetrends.htm as of October 2008.