Niel
All of your examples are either heavy pigs or in the case of the Aptera, technically a motorcycle that seats 2 and doesn't have to meet any crash testing standards. Its not a flaw of GMs design here. It simply doesn't make sense to cram into one vehicle:
ICE
Generator
electric motor or motors
40 miles worth of batteries.
The displacement and weight of the ICE is irrelevant by comparison to the inefficiencies built into the series hybrid. No matter what engine you put into it, it will still be a 4000 lb car compact car. I would rather ditch the ICE all together and have a pure electric that goes 100 miles.
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