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On my ls1 camaro smoothing and porting out the throttle body made it get better mileage at wide open throttle so I think it went up to 3.1mpg or some other equally meaningless number. It didn't change the mileage at all overall, but it did let the engine rev quicker so it was even harder to launch the car off the line.
I suppose under an ideal situation you might get better mileage. But for the most part at partial throttle that big throttle blade is 99.9% of the intake restriction. Smoothing it will help very little unless your tps sensor is now reading a bit off and making the computer do something different.
Porting them is much easier than it looks so if you want to do it I would say just get a dremel and do the one you already have and save your money.
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