OK. Just returned home from a 500 mile trip. 90% highway and 10% in town. I kept my speeds at 55mph and the posted limits in town. Had a tail wind for the last 90 miles, but it looks like I'm at 31 mpg. Maybe a little more as I STILL haven't fixed the leaking filler neck. I am still very impressed with the smooth and quiet ride of the A/T tires. They had great grip this winter. The only thing I changed for this trip was I did the coil pack mod. For those who don't know this one you can read about it here.....
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It seemed to help with take off and climbing hills. I wasn't down shifting as much and take offs were a bit quicker according to the butt dyno. I have to wonder about the increased clearance. I think I need to finish my air dam to keep some of that air out from under the truck. That and fix that filler neck so I can get some accurate numbers. Has anyone here done an airdam and side body skirts? Not wheel skirts but ones that run along the body below the rocker panels. Do they help or do they only have minimal impact?