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"Ah, so what you're telling me is that the car will add more fuel to the air ratio to even it out and consume more gas? I don't think the amount would be significant enough to cause a drop in fuel-efficiency. Plus, I mentioned pumping losses as an explanation for the alleged increase in MPG's that performance companies claim from their products. "Work is work," so if the engine has to "work" to get the air in, it's going to have to rev higher to do so. Don't you want to make it easier for it to do it's job?"
The air pump can't tell the difference between manifold restrictions and throttle butterfly. At part throttle, their relative percentages are irrelevant. Real ecomodding is a lot cheaper than performance work in some areas. What's the length of a tuned exhaust at maximum mileage? Can pulses get through the close-coupled cat, anyway?
If warm air can carry enough oxygen in for the power required, it will flow easier, and vaporize the gasoline better. Presumably, except in open-loop, near wide open throttle, the injectors will keep the mix lean, just enough for good ignition. See the "warm air intake" threads. (WAI)
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