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this is a general answer, but if you drive normally, it wont affect it much at all, yes the engine is turning it so there is a bit of extra work involved. But like any other performance mod, you step on teh gas to use it, your mpg goes down. I could say i get 280 miles per tank taking it easy and 240 running it harder, stepping on it often, but still daily driving on the freeway, no strip time.