Did my first hard pull with mods listed, Smarty on level 3. Pulled in Tow/Haul mode the whole way. Weighed truck and camper at Flying J at 17,400 pounds. Ran her hard avg 75 mph, even up big grades never got below 70 mph, temps would just touch the 1300 degree mark with probe in the manifold but could just feather the pedal and keep it between 1100-1200 on a big hill. Mileage was only 9 mpg but at over 17K and running that speed does this sound normal for mileage, I was hoping for more but I know thats heavy and fast so any feedback is welcome. Other than slow down

 

If you run her at 70 and keep the rpm's at 1900 you will do better. Anyways that is the sweet spot on my truck!

Shane