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possible to lose mpg?

1240 Views 7 Replies 6 Participants Last post by  dwinballer
i installed a cai and a flowmaster series 70 muffler, is it possible to lose mpg as time goes on? i thought i should improve...i did improve at first but seems to be going downhill.the performance is better. i don't drive an different now that i did in the past. i live in a town that has stop lights every damn block but still.....
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You might not think you drive different......but you do. To make more HP takes more fuel, (Newton and all) and I will bet you step a little deeper in the throttle now than you think you do. After all, why spend money on performance parts if you aren't going to try them out from time to time.
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