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I know there are several ev drivers who carry a small honda generator with them incase they run out of juice and run that, plug it into the charge outlet, and drive home. So it is viable to have an engine run an alternator to drive on. That's what the metra trains do itf i'm not mistaken, they are diesel "hybrids". But what size it would have to be, i'm not sure. The Chevy volt kind of does the same with an engine that creates power to drive and recharge the batteries when they get low, but when it's running on only gets about 40mpg's, which is no where near the mpg equivelent of a full ev vehicle.
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