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I'd have to take issue with your third point - aerodynamic drag is about HALF the load on the drivetrain at about 28-30MPH, and at highway speeds it is about THREE QUARTERS. That is the most significant part of the MPG equation, assuming you cannot improve the efficiency of the drivetrain very much.
And unless you convert from an ICE to an EV, then you cannot improve the efficiency of the drivetrain very much.
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