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The EPA is aware that range-extended electric vehicles can game the current fuel economy test to deliver mileage estimates way up in the stratosphere. It makes for impressive advertising, like General Motors' touting of the Chevrolet Volt's estimated 230 mpg, but the EPA wants to give a more realistic reflection of the fuel efficiency of these types of cars, and it's not alone.

It's no secret that the EPA's mileage rating are not an accurate reflection of how many miles per gallon a car will get when driven in real-world circumstances (i.e., everyday). J.D. Power and associates came out with a study recently that found that not only did hybrids only get about nine more mile per gallon than a comparable standard vehicle, consumers didn't really know that hybrids aren't that much more efficient than their gas-only versions. But why is this? part of the answer lies in the