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It has absolutely nothing to do with your gas mileage.
The air pump is strictly for emissions purposes on cold start ups. If i'm not mistaken, its only on for the first 4 minutes of startup.
Its a total waste. I had mine completely ripped out.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.