I don't think the two throttles would be a huge problem since mixing and matching would only be done during WOT, at least IMO. If we're going slow, just shut off the engine because low load efficiency blows anyway, and if we're above a certain speed where it makes sense to run the engine because it's operating efficiently enough, just make sure the electric motor in the rear doesn't engage unless we turn it on or we have something where it'll kick in at WOT or similar. Doing something similar with RWD is a bit easier as long as there is enough room to mount the motor behind the trans and shorten the driveshaft to accommodate the motor. From what I've read there's a ~1-2% drop in mileage at lower speeds due to spinning the motor around, but it's easier to use, and we can even run accessories on electric power by engaging the gear box assuming we can kill engine ignition, although it's pretty lossy spinning an entire engine over just to run an A/C compressor.
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