Frank, the point was using something that's already an ev, and reliably making it have an extended range when necessary.
Nobody is talking about making a car that always runs on a generator, or any thing like that.
Doubling the battery pack size isn't viable for several reasons, including weight/vehicle capacity, and shelf life of the batteries when they're not being used.
A generator is relatively cheap, and has an alternative use, and probably weighs less than 250 miles worth of batteries anyway.
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