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For fuel economy you want lower volumetric efficiency because otherwise the engine expends energy to limit volumetric efficiency. I personally don't think that raising intake temperature is the right way to do it because when you actually want power you're going to cause some problems, but people do see gains.
Ideally, you would use cooled EGR or something like that. The Prius has it for example, and I think trucks have it for emissions reduction.
(sorry this post has nothing to do with aero :P)
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