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  1. fatnfur
    Thread

    chip for better gas mileage?

    Hi all, I have been towing 15k lbs with my 07 powerstroke and would like to know if a reprogramming box would produce better fuel mileage (like...
    Thread by: fatnfur, Jun 1, 2007, 4 replies, in forum: Ford Powerstroke 6.0
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