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The Department of Energy's eGallon is intended to let plug-in vehicle drivers know how much they're saving per mile compared to motorists in gas-powered rides. It's not perfect (the numbers behind the methodology need to be updated, for starters) but it does attempt to give the average driver an easy-to-understand price tag to look at. Turns out, says the Northeast Group, a Washington, DC-based smart infrastructure market intelligence firm, even the low number that the DOE provides isn't accurat