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I MIGHT be getting my hands on an 83 to 85 Crew Cab F350 4x4 duallie with a 6.9 and a C6. I would end up selling my current F250. I am currently getting about 10 mpg with my 351.
I know there are a lot of variables here, but was wondering if any body has a similar set up and what mileage are you getting?
I don't have that setup, but the 6.9 empty should get 15+ mpg. But remember the 6.9 is a power horse but not fast. I have seen them turbo-ed. That mades a big difference in pulling & a little better mileage.