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  1. More mpg towing?????

    Towing & Hauling
    We just added a 2005 ext cab to the towin fleet. It is a dually. It has the LLY. We just took a 340 mile rode trip towing a trailer and only got 10mpg towing.:help The truck is bone stock, and has the auto tranny. Ive read to upgrade the turbo mouthpiece. Where do I find one? I would...
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