Have 97 3/4ton with a v-10, 354 gear ratio pulling about 9000lbs not a problem. Will get 10 mpg pulling if I don't push it to hard and have a headwind other wise it can go less. I get 13 to 14 highway no trailer. In town all depends on how you drive.if you have a heavy foot taking off it will suck the gas. I don't baby it by any means and to date real happy with the truck. 76,000 miles on it now. If I pulled more often I will be thinking diesel next time.