Gathered some data after my recent trip from the Seattle Area to the Rock Springs, WY. 2023 Airstream International Rally. This was my first trip out of State and traveled a little over 2020 miles with around 20 of that local, "Maxine" back at the site with over a couple of thousand other "Streams".
I attempted to keep it to arond 63 MPH, however, with Truck speeds @70, and Cars @80 in sections, I pushed a bit faster in some areas. There also were the construction zones which we all love creeping along in for miles on end. Towing mileage was just short of 14, and there were hills to pull, and headwinds ( going home) to buck. My oil was changed prior to departure, and it barely used any, so the extra Quart was dead weight. Best 25 mile loop in this Denali is 32.8 according to the on board computer. I checked out the cargo capacity of a 2023 Denali and it is roughly 150 lbs less than my 2020, due I suspect to the self driving components, and more steel in the engine. My rear axle was maxed so a new one would not work for me. To my amazement Diesel was cheaper that both alternatives at a local Station. My towing experience has been outstanding in this
1500, with plenty of torque to charge off of those on ramps. I just do not like driving the bigger trucks, so for now I am completely satisfied. My Carbon Pro bed does help a bit with weight, however, the Red Brambo Brakes add it back on. ....J