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Isn't warm air intake supposed to give you better gas mileage because the air is less dense?
the idea behind a WAI is that when you need a given ammount of oxygen to deliver a given ammount of power reducing the oxgen level in the air will call for a bigger throttle opening to deliver the same ammount of oxygen. a wider throttle setting will result in less flow restriction and thus less pumping losses, the downside is that once the throttle is virtually fully open there's still less oxigen comming in than without the WAI and so top performance will suffer.
because modern engines monitor all sorts of parameters the engine might react to the lost performance or changed emissions by injecting more fuel to compensate thus resulting in less FE
so i wouldn't automatically assume WAI will improve FE in an injection engine although it's quite possible it does on some engines (on a carbed engine it probably will have a more predictible effect) (also it depends on climate youre in etc)
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