Thank you for the feed back. I run about 70mph most of the time. We tried it at 55 one day on a trip and it picked up a few tenths of a gallon. When I 1st got it I was only at 13.8 when it got about 3k miles on it it got up to 14.5 and has stayed there. Now the fuel pump is noisy as hell.
Truck has steered to the left since new. taking it to another dealer the next time. Thanks again Dale