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That might be useful... using an electric motor sized to provide just enough power for freeway or surface street travel that's able to do regen but leaves starts and acceleration to the engine.
It seems to me that the problem in many cases is having the ability to vary the mechanical advantage between the assist/regen and the drivetrain... Anything with a fixed gear ratio is going to provide much less braking power as the vehicle speed approaches zero, as well as less power to push at lower speeds...
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