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    LLY: poor fuel mileage

    yea i changed fuel filter and oil first day i got it. i had a dioblo sport tuner on it but didnt inproved milage much so took it off. and yes its a really short pipe on the exaust its maybe makes it to where the bed starts. "its a crew cab" and it has a k& n air filter on it
  2. S

    LLY: poor fuel mileage

    i just bought a 2005 duramax and have only been getting 13 miles per gallon. i crawled under it and seen that it only had about a 7 feet piece of 3 inch pipe for the exaust. i was wondering if it only being 3inch pipe was my cause for bad fuel mileage cause besides that the truck is stock.
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