I drive a 2001 250 w/ 160000 rough miles. I really work my trucks and it shows. That said, I will not even think of owning anything but the 7.3. I have a 2000 f350, 2003 f350, 2001 f250 and a 2002 f450. The 7.3 is the best engine I have ever run. Milage on 250 runs from 14-18mpg depending on load/speed.