Good read if you want to know some facts about MPG calculations versus claims. - MBC
http://www.economist.com/daily/columns/techview/displaystory.cfm?story_id=14292008&fsrc=nwl
"...The efficiency ratings that makers are claiming for their plug-in hybrids are nonsense. They are little more than figures plucked from the air because they depend on specific sets of circumstances. That makes comparisons with fossil-fuelled cars almost impossible..."
"...forget GM’s outlandish claims: the Chevy Volt will get at best 50mpg in the city. As your correspondent noted at the beginning, that is not at all bad—but it is nowhere near the preposterous 230mpg being touted..."
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