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I think the answer is EVs with small ICE generators for when they need more range. I think if the vehicle is light enough, this backup generator can be portable so you don't have to waste energy lugging it around.
The volt could have been this vehicle, but, it is way too heavy and the ICE is much to large to be portable.
Another possibility is a trailer mounted generator. Imagine a mini-van type EV with a range of perhaps 50 miles. Great for many commutes, local errands or kid hauling. Add a trailer generator for weekend trips. This trailer could serve double duty. its primary purpose being to supply electrons, it could also be boat tail shaped so the minivan would be aerodynamically cleaner with it.
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