9.75 MPG
Yes you read that right.
The tank after that? 9.23. In case your wondering if I overfilled, screwed up the math, or anything.
The last tank is probably around 8.2, since I haven't filled up yet.
Let me qualify:
Picked up a load 8000 lbs in Winnipeg to Wichita. 25 mph tailwind the whole way down.
When I got there, load offer for 7000 lbs back home. The wind also switched to a south wind. South Dakota was a bit windy, that's why my fuel mileage dropped. But it switched back to a south wind when I got into North Dakota all the way home.
It was a nice easy pulling trailer too.