I left early Friday AM with Scott and Vanessa heading to Kentucky to pick up 2 pups from the last litter my Lab Spud sired. Scott was getting one and Vanessa was get one for her niece as a surprise. Anyhow, I filled up the evening before about 2 miles from my house, and tripped the mileage counter back to 0, as well as the overhead. Picking up Scott and Vanessa probably added 40 miles to how I normally drive down there, but I don't think it would've mattered one bit.
We left early (6:00AM), but it was hot by 8:30AM, so I clicked on the AC. It's hard to talk running down the highway with the window open!!! Got down to KY, hung out at Dougs with the pups, went and had dinner, went back to the pups afterward, and then drove to the hotel on Friday.
On Saturday (today), we drove to the restaurant for breakfast, over to Dougs, hung out there for a couple hours and then headed back to northern Illinois. I filled up just South of Mount Vernon, IL on the way back. 620 miles on the tank, and the DTE on the overhead was reading 36. Put in 30.7xx gallons and it figured to 20.2mpg.
But get this.....................that's running 2k rpm or about 68mph, with the AC on!!! Can you say "happy camper"????? It was 90* for most of the trip down and back, and I've always said that my truck gets super mileage the "hotter" it is outside!!!