At
www.fueleconomy.gov, they give a breakdown of a BEV's energy bookkeeping:
* 10% charging loss
* 2% accessory loss
* 15% electric drive losses
* zero-to-2% auxiliary electrical losses
* 0% idle losses
* 6% Regenerative braking energy returned
* power to wheels = 77% - 79%
* overall 23% losses
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1) plus 47% aerodynamic loss
2) 23% rolling resistance loss
3) 7% braking loss
= 100%
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If one has a strong bladder and minimizes rest stops, the significance of braking losses is diminished, allowing more available power for aero and rolling resistance.
Aerodynamic drag dominates the mathematics.
BEVs typically already have low R-R tires.
Aerodynamic drag reduction would be the obvious choice for range extending ( see the 2022 Mercedes-Benz EQXX concept ).