The gap between the estimated fuel economy demonstrated on a car's window sticker, and that which is achieved while driving in the real world, has always existed. Further, there has always been a difference between the mile-per-gallon numbers submitted to the Environmental Protection Agency by automakers, and those that the agency has garnered for itself in independent testing. In fact, according to an Automotive News report, the EPA believes that gap has gotten "unacceptably high" over recent years. The difference between EPA and automaker estimates was 1.15 percent in 2007, and jumped to 2.25 percent in 2010.
Autoblog , EPA chides automakers' fuel economy test drivers for being 'too good', EPA chides automakers' fuel economy test drivers for being 'too good'
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