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I did some research and it does appears that the 60mpg mark is about right, coal is pretty much the dirties (air wise) way we can produce electricity, so if you look at it from the point of an electric car is only out done by someone who is getting 60mpg and in the US that is not happening, so of course this is going to be used by people who are getting 20mpg as the reason they should not be driving electric!
From what I could tell the study was not a true study, it was just someone looking up the numbers of co2 released for the different fuels, if it had been better researched then it would have included the refining of the fuels, the shipping and mining of it, but it was just the numbers at the tail pipe or smoke stack.
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