Hi Christopher,
Yes, that Mini hybrid is a prototype that had 160HP electric hub motors in each wheel, for a total of 640HP, and IIRC, the generator was spun by a 2-cylinder 250cc ICE. And yes, they claimed ~85mpg while running in the hybrid mode, which is very impressive indeed.
The Aptera 2h will also be a serial hybrid, and again IIRC the ICE will be ~15HP -- big enough to "keep up" with the battery discharge in any situation. And it is projected to get ~130mpg, which is even more impressive.
GM really missed the boat using an existing 1.4L 4 cylinder ICE in the VOLT -- it is way too big, and adds way too much weight to the car. I think they are mentioning mileage in the 50mpg range -- woo woo.
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