Better acceleration, or well more even acceleration? When your behind a tractor trailer getting moving at a light, it like yeah he accelerating pretty fast, wait, shift. and your braking into him.
A small battery bank would be beneficial for engine autostop. Autostop at lights, going downhill.
If you wanted an EV mode for slow highway traffic jams, thats another thing. Imagine the wieght and volume of the batteries to be able to move a tractor trailer! Maybe a hydraulic or pneumatic compressed tank to store braking energy would be cheaper. Powered by an electric pump/generator. But this is just me thinking out loud...
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I try to be helpful. I'm not an expert.
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