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possible to lose mpg?

1239 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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I think this would be the exception and not the rule.
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