So I have had my truck ******d for over a year now and the best I can get is 13mpg city driving. It has h&s mini max, egr ******, proflow 4" w/muffler and NL stage 2 intake. Do you guys think having the muffler is killing fuel Mileage? What kind of mpg are you guys seeing? I'm pretty much in performance mode all the time
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