I have a fleet model F-350 at work. The thing never shuts of in a 10 hour work day. The computer on the dash tells me it is about 7.5 mpg. And my brother just bought one. He claims around 17 mpg on #1 winter diesel. We are in MT and ND and drive around 80 mph on the interstate. I suppose some one who drives around 65 might get around 20 mpg. I have never seen better than 18 on my 06 6.0L.
I had to check out this area of the forum, as I am look at a knew one myself.
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2006 F-350 6.0L 4X4 AFE Intake, Banks Technicooler intercooler system, turbo back MBRP 4" exhaust, 70 Horse Depaco injectors, FICM and ECM/TCM Roll back, Gryphon programmer and Custom Tunes on the way 
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