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Re: Yeah, this is about gas mileage efficiency, again
i recently put a flowmaster 50 series suv 2.25/3inch exhaust on my 99 tahoe and since then my gas mileage has gone downhill bigtime. i'm getting about 10mpg now. i don't know if maybe it's because i'm putting my foot into it more because i like the sound or what. but i thought the exhaust would increase mpg...
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