How do I improve gas mileage on my 2010 F250 Super Duty.
I have an F-250 Super Duty with the 331 gas engine. It develops plenty of power to pull our shorty 5th wheel, but mpg sucks, literally. I bought it a year ago, and put in a new engine, I can't seem to get better than 9-10 regardless of in town, or hiway. It came with larger tires, and I suspect that to be a major participant. With returning to the factory suggested rubber, and maybe octane boosters, are there any other ideas for improving mpg? Any help would be greatly appreciated.