With the truck stock i could make a trip to the lake and back, running 80 mph and would see fuel mileage between 14-16 mpg empty. The trip is from st. louis to lake of the ozarks and back. I fill at the same station in st. louis when i leave and when i get back. I based the mpg by hand calculations. That trip usually involves some drving around town and the ocassion stop light punch. Made that trip this weekend with the tst. was on tq of 3 all the time. pwr level from 4-6. this trip also had a few smoke shows and eating 2 new pwrjoke 6. 0 for lunch. when i go to st louis to fill i calculated by hand and got 18. 2.
I figured with the smoke shows going that fast and the extra pwr i would get the same or worse. Will test the results again next time i go. Haven't been able to test the towing mpg yet. the boat is in the shop for fiberglass work
should get it back this week and be towning this weekend with the slide in truck camper as well. will post those when i know them.

