Well, this tank of gas included letting the truck warm up every morning, frequent cold starts and driving around town. I'm at about 240 miles and expect to put another 25-35 miles before the fuel light comes on. That would put me around 20.5 gallons consumed. Which puts city about 13-14 mpg uncorrected for larger tire size. My 35's and wheels weigh in at 84lbs, stock 17's and beat 265's were 73 lbs so the weight increase was marginal. Once on the highway I expect to get 14-16 depending on if I draft a semi. Overall, I expected a larger decrease in mpg but I'm happy with the current specs.