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My 2003 250 w/ a 6.0L gets 11 mpg, highway and city. i once got it up to 11.8 on a 1300 mile trip to florida. and i don't really have a lead foot. it runs great but I swear theres something wrong.
I get 13-14 city and 16-17 hwy@75mph with the 4.5 lift and 35's. Before the lift and larger tires, I got 15-15.5 city and 18-19 hwy@75. 2005 crew diesel shortbed. At first, i had a 1mpg drop after the lift/tires, but the the 15ppm diesel came out and lost another mpg
I have an 03 F250 SB with the 6.0. I get 14.9 (according to the overhead console) around town. I pulled a tandem axle car hauler (this was last night) with a 5x10 utility trailer full of furniture (lost wheel bearings on this utility trailer)....From WV to PA empty (to go retrieve the utility trailer) I was getting 15 MPG. From PA back to WV (we encountered constant high wind gusts of @ 50 MPH) loaded, cruising between 65-75 my MPG went down to 14.3. I was really pretty happy with both fuel milage and performance.