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GM has been talking since day 1 about a 10 year/150,000 mile warranty on the battery packs.
Mileage? The first 40 miles are fully electric. After that, the generator kicks in and it keeps charging the pack as long as you have gas in it. Nice part about this technology is that they can swap out the engine and use any technology they want (diesel, biofuel, whatever)as the engine only works as a generator.
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