I absolutely have an obsession with the powerstroke lifted f-250's 99'-01' and i am soon hoping to buy one. I was just wondering what the gas mileage would be on one. My father has a cummins 3500 dually and gets about 20mpg. Even though i love these trucks i cant afford to be getting terrible gas mileage. Any insight?

 

I have a 97 F-250 with a superchip and 35 inch tires. I get 18 mpg in town and 19-20 on the highway.