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I like the fact that the EPA appears to be using Wh/mi for electric cars, not something stupid like mi/Wh.
Gal/mi would paint the clearest picture in the minds of Americans. It spells out the fact that a few mpg in a very thirsty car is a very big deal. For example, improving from 15mpg to 17mpg saves as much gas as going from 30mpg to 34mpg, or 60 to 68mpg (though of course, 60mpg > 17mpg). Thus, even though a Silverado hybrid or an aerocap may only save a few mpg, it's a very big improvement, which would become apparent in a gal/mi scheme.
It would also allow the average person to calculate how many gallons per year he will burn based on how many gal/mi a given car requires.
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