Join Date: Jul 2012
Location: AJ, AZ
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Sounds like a good plan! Considering you've got a dually with 4.10 gears, I'd say 15.5 mpg is great mileage, especially at 75 mph!
When I do calculate my mileage, I find that I'm somewhere around 15-16 mpg (I've done better and I've done worse, but this about the average). I have a SRW 4X4 with 3.73 gears and 35" tires, and I typically drive around 70-75 on the highway, FWIW.
Considering these trucks only have 4 speed autos, their fuel mileage always amazes me. I had a 2005 Duramax and typically only got 15 mpg with a 5 speed auto.
2000 F350 4X4 CCSB w/ 7.3 and 4R100
PIS 175/80, Adrenaline HPOP, 4" Exhaust, 6637 Filter, CCV Mod, Leveled Front, 315/75/16 Goodyear Duratracs