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I've said it before, but a pusher is mostly a solution in search of a problem, even if a neat one.
The BMW i3 gasoline engine is puny. You won't notice the difference in weight or performance much. It accomplishes alleviating range anxiety with a minimum penalty in weight and complexity.
It would be neat to see a pusher capable of outputting slightly more than needed to maintain steady cruise, such that it can slowly charge the battery. Get enough charge back into the battery, and you could assist the pusher on uphill climbs and acceleration events with the electric motor.
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