I have 2005 Chevy 2500HD 4x4 DuramaxwAllison, 4" turbo back exhaust and Hypertech programmer set on level 2. I tow a 2980RL. My last trip I pulled to Malibu, Beach from San Diego, Ca. my fuel mileage was 14.0 at 60mph with tow haul mode and cruise. Just like sitting in a easy chair. GET ER DONE!!!
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