I also know a guy with an electric pickup truck. He sometimes throws a gas generator in the back for when he has to do a long trip.
The big thing with a generator for a serial hybrid is that it needs to be powerful enough to equal the average energy use of the motor. Typically, that's pretty big.
One of my "back-burner" projects is a bio-diesel pickup truck. I have some ideas for making that a bio-diesel/electric hybrid, as the truck frame gives a lot more room for hybrid components than a Geo Metro ever would.
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