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Your mileage sounds pretty normal to me. It will vary alot depending how you drive. I have had all versions of a STOCK 7.3, 6.0 and 6.4 and they all get about 15-16 on the highway and 13-14 farming/choring. Everyone of them get 10 when pulling a trailer/hauling cows. I ran a chip for while on a 2000 F-250 I had and the power was awesome but it got the same MPG so I returned it to stock.
My nieghbors 7.3 got 19 all the time is what he told me, then I borrowed it one day and drove easy(not my truck) and went 200 miles and it got 16. Its amazing what the MPG is when you actually use a calculator.
I do have a 1996 psd f-350,crew cab, long bed 2wd, 5 speed, dually and it gets 10 MPG no matter if theres a tail wind or your pulling 15,000 pounds up a mountain.
With saying that all trucks are diferent. There is alot of good pointers on this site to help the mileage, mostly run stock, good tires with the proper PSI and keep your foot out of it.
best of luck