I think a few of these guy's are getting the gas gauge confused with the oil pressure gauge. I just bought a 99' ext. cab with 25k. Truck is cherry. It came equipped a 5th wheel tow package (not my choice but couldn't pass up $20k). I'm not sure what gears I've got but I can't get better than 10mpg. In town, out of town, driving backwards, etc. etc. IT'S ALWAYS 10. My buddy also has a f250 with a normal set-up and gets the same mpg. Good luck. Great power, better ride, and they look cool as hell towin' a go fast. just my .02If you think you should slow down, DON'T DO IT MAN! DON'T DO IT!