Fuel Economy Labeling of Motor Vehicles: Revisions To Improve Calculation of Fuel Economy Estimates

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The Environmental Protection Agency (EPA) is finalizing changes to the methods used to calculate the fuel economy estimates that are posted on window stickers of all new cars and light trucks sold in the United States. This final rule will greatly improve the EPA fuel economy estimates to more accurately inform consumers about the fuel economy they can expect to achieve in the real world. The new test methods take into account several important factors that affect fuel economy in the real world, but are missing from the existing fuel economy tests. Key among these factors are high speeds, aggressive accelerations and decelerations, the use of air conditioning, and operation in cold temperatures. Under the new methods, the city miles per gallon (mpg) estimates for the manufacturers of most vehicles will drop by about 12 percent on average relative to today's estimates, and city mpg estimates for some vehicles will drop by as much as 30 percent. The highway mpg estimates for most vehicles will drop on average by about 8 percent, with some estimates dropping by as much as 25 percent relative to today's estimates. These changes will take effect starting with 2008 model year vehicles, a