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Originally Posted by Scarab
I know not another mileage thread, but just curious if anyone else lost mileage after exhaust and volant. I have a CC 4X4 with Big Tow with 5,200 miles on it. I put the volant on first and was getting 14.23 mostly city stop and go driving. I put the JBA cat back system on and now I get 13.23. Anyone have any idea why. I did not reset the computer overnite. Any thoughts on this. Also, the JBA system I have replaced my rear cats with resonators. Maybe a problem?
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Mine had the EXACT opposite effect. The first tank or two, I was putting my foot through the floor to hear the intake/exhaust, but after that, the milage was MUCH better.
Maybe its the crappy Christmas gas we get like GETSOMZ28 said. Try resetting the computer and get some fuel that hasn't changed for the season (where?)?