Since torque is necessary to get the mass in motion and electric motors develop maximum torque at zero rpm, you can get away with small motors on two or four wheels.
The diesel or petrol engine can be very small and still power a generator big enough to supply power. Plus the engine will be designed and tuned to run at a specified constant rpm for maximum efficiency. With an engine accelerating and decelerating both waste fuel, and can't run below a stoichiometric fuel ratio of 14.7:1 safely. But running at a constant speed/load it can be a little leaner.
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The descent of man ~ Nixon, Friedman, Reagan, Trump.
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