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It takes less power to move at a given speed with better aerodynamics. The engine is still spinning, so to make less power, you give it less throttle, which gives it less air (and thus less fuel), so it will make less power at the same engine speed. Try going from a flat road to a slight downhill. In order to not speed up, you have to lift up on the throttle a bit. Its the same with better aerodynamics.
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