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My brother had a 450 with 4.30's and that is about what he got unloaded, maybe a little better but it all depends on speed. Towing he got better, his fiver is around 15500 or so.
I have one with 4.88's and stock it was right about what you get, I got a little better towing 18000# tall fiver, but again depends on your foot and speed.
The best way to get mileage out of the 6.4's is to tune and delete them. If you keep you speed at 70 or down unloaded you can get in the range of 16-18. But remember they smog diesels now in CA.
 
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