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Thinking about this: the cool thing about improving aero on an EV is that the range benefit will be greater than the same mod on a gasoline ICE vehicle.
Reducing power requirement for a gasoline car reduces fuel consumption, but it also moves the engine further from the best BSFC island (assuming cruising conditions).
So let's say a particular mod returns a 5% range increase for a gas car. It's going to be greater than that for your EV because you're not penalized for reducing pressure on the go pedal, the way you are with the gas engine. In fact the EV gets an additional bonus: not only do you reduce power requirement for a given speed, but by reducing current draw you also reduce Peukert losses which increases range even further.
So a 5% fuel economy gain in a gas car is definitely going to be a greater than a 5% gain on an EV.
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