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Well - diesel and electric don't suffer as much from pumping losses so there is no such thing as a more restricted air intake when better aerodynamics results in less throttle.
However, if you p&g with the gasoline engine, you don't increase your suffering from pumping losses because you only use the engine with open throttle.
As been already said, you will always gain with improved aerodynamics, even in steady state driving. Engine efficiency probably drops a little bit more with a gasoline engine though.
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