wouldn't it be FAR more efficent if it was connected to the wheels?
But then they'd have to engineer a torque-splitting device (transmission) that didn't infringe on Toyota's brilliant system and patents (which so far 2 other manufacturers - Ford and Nissan - have licensed, rather than try to invent their own flavour of the same thing).
I think that's one reason GM is avoiding the parallel approach. Also, it gives them much greater packaging flexibility.
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