Ya, I've thought that as well. The drawbacks are you still have to do regular oil changes, risk of fuel going bad, and dragging around an ICE when you don't need it. But in the short term I think it is a good way to go. 500km range batteries are expensive, and there simply isn't the current capacity to put them in all new vehicles. But if every new vehicle had a small one for around town driving? That's doable.
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