Sorry, but you're incorrect.Ha I will agree with your first response (I was about to tell him same thing but more...) and disagree with your 2nd response.
There is never a time where the gas engine drives the wheels. You had it right with your first comment in that it is a generator only. The electric motor is the only source of power to wheels. The gas generator (as that is the best way to understand it) simply sustains the battery but can also be used to warm the battery during extreme cold temps (a huge advantage over straight EVs) and can be forced on (called Mtn mode) to build up additional battery range when going into steep grades. The generators goal is to always keep about an 20% buffer left on battery and putting more charge on the battery before you enter a steep grade helps with that. I only had to do that a couple of times driving on WV Turnpike at some of the steepest sections. I think that might be what you are referring too.
But battery drives electric motor which drives wheels. Doesn't matter if your going 1 or 100 mph.... so many misconceptions about the Volt that it wore me out defending the little car when it was new 11 years ago. If you think there is pushback with EVs now try owing one back then .. I actually bought it for the new tech, and like being a guinea pig for new ideas. Many on here will not admit to this but this is similar to us early adapters with Bronco.
"However of particular interest, when going above 70 mph in charge sustaining mode, and the generator gets coupled to the drivetrain, the gas engine participates in the motive force. GM says the engine never drives the wheels all by itself, but will participate in this particular situation in the name of efficiency, which is improved by 10 to 15 percent."
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