I drove my M1010, 6.2 NA, turbo 400, 4.56 gears on 35" tires from San Diego up to the local mountains. Rig weighed in at 6500 lbs withe aerodynamics of a brick (even more than a 'burb). I was pulling up the grades on the freeway, cruising at 55-60 mph and honestly, it wasn't as bad as I...