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Aerodynamics is more important than weight. Stop and go driving is hurt by weight, but any speed above 28-30MPH aero drag is by far the largest loss. Weight adds kinetic energy, and coasting can 'reclaim' some of that energy, but aero drag is always a total loss.
Also, why limit this to existing drivetrains? Almost any EV can nearly *double* this rating, already.
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