I had a 99 F-350 dually with the 7.3. It would get 15 to 16 around town and 17 on highway empty. Got 12 loaded with 34' gooseneck with 12,000 lbs of round bails. Wish I had it back. I know own a 2003 f-250 4X4 with the 6.0. I get 15 around town and 17 on highway. On the highway I get 12 loaded. Main thing with diesels is keeping the air filter and fuel filters changed and clean. Also the turbo charged ones you need to keep the coolants flushed regular.
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