Join Date: Apr 2012
Location: Eagle River, AK
Heck, I saw an immediate loss in mileage when going from the factory Michelin AT2's (should be considered street tread), to Cooper AT3 XLT's in the same size. Mud Terrain will also show some decrease due to additional rolling resistance and weight.
2012 GMC Sierra SLT 2500HD Z71
Cooper AT3 LTX's, Reflex Spray-In Bed Liner, Undercover Bed Cover, Undercover Swing Case Tool Boxes, XPel Clear Car Armor Film, UltiMat DashMat, Rear Underseat Storage, Rough Country Stabilizer, F&R Dura Flaps, High/Low/Fog's All On Mod, AMP Research Power Steps, TorkLift Stable Loads, HD Timbren SES, Bilstein 4600's, Hellwig Big Wig rear stabilizer