Couldn't believe it today. I filled for a trip yesterday and drove home. When I pulled out of the drive it said 13mpg. It was early morning, 6am, and I was headed for Portland. When I stopped at a light just before I hit the freeway (103 miles) I looked down and it read 18.1mpg!! I went a block to the next light which took me onto the freeway and it was18.0 and by then I had my camera and snapped a blurry photo.
The first hundred was on 2 lane road at about 55-60 mph and several small towns. I haven't looked but I was nearing 600 miles today and final mileage was 16.2 when I hit town. Freeway driving was 65-70. The one thing that did hurt mileage was a freeway wreck which was stop and go for 10 miles and an hour.
I think the truck will get 17++ if I used the speed control and keep it at 60 and out of towns.