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Originally Posted by Orcrone
TK, aren't the EPA numbers provided by the manufacturers using EPA guidelines. I didn't think the EPA actually did the testing. That's why I don't understand why it would change.
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Actually, it is both. The mfgs follow EPA guidelines and submit results to the EPA. But the EPA also tests cars to verify that the mfgs are following guidelines and are getting the same results as the EPA testing. The EPA may not test every single model variant in a line of cars, but they do test each model as far as I know.
http://www.epa.gov/fueleconomy/data.htm
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The test data used to determine the fuel economy estimates posted on the fuel economy labels and to calculate a manufacturer's corporate average fuel economy (CAFE) is derived from vehicle testing done at EPA's National Vehicle and Fuel Emissions Laboratory in Ann Arbor, Michigan, and by vehicle manufacturers who submit their own test data to EPA.
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