The U.S. Environmental Protection Agency (EPA) is responsible for motor vehicle fuel economy testing. Manufacturers test their own vehicles and report the results to the EPA. The EPA reviews the results and confirms a portion of them using their own testing facilities. Beginning with Model Year (MY) 2008 vehicles, all fuel economy estimates are based on new test methods that better account for actual driving conditions that can reduce fuel economy, such as high speeds, aggressive driving, use of air conditioning, and cold temperature operation. As a result of the new methods, it is anticipated that the estimates for most MY 2008 models will be lower than their MY 2007 counterparts. To aid consumers shopping for new vehicles, the EPA has also redesigned the fuel economy window sticker posted on all new cars and light trucks to be easier to read and understand. The EPA is responsible for providing the posted fuel economy data. For more information, visit the Fuel Economy Web site. (Reference 40 CFR 600)
U.S. Environmental Protection Agency
Phone (202) 272-0167
http://www.epa.gov