Bill did my 2003 6.0
FICM and I really like how it works. Have not had it long enough to get an accurate MPG yet. I know my Lie-O-Meter says it is getting a better average. I really like how it will lock in OD at under 50 mph with a 3.73 gear and still pulls up hills without much pedal and stay in OD. I have to drive in many areas of 35 and 45 that is watched by the Man often. My truck has never performed better in this speed range. Shift spacing is good up through the gears and it has no harsh shifts. At 60 to 70 mph still has good response to pass without a down shift.
This is how Ford should have programed the 6.0 from the start.
Thanks Bill.