Darrell,
I have a 2005 F250 PSD and it gets almost 18 mpg when not towing. It has 40K miles on it and the miles/gal wes much lower until I got around 25K miles on it. I have kept track of all fuel put in it and you could see the milage getting better up to 25K and since then it's kept in the 17-18 miles/gal range.
I was pulling a 4,000 trailer and it didn't effect the fuel milage too much. With the 5th wheel the mileage drops but boy does it tow so much better then the little trailer.
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