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Taylor95,
I don’t expect a huge increase from just the gearing. Currently the truck is way over geared as there is more than enough torque to climb hills in overdrive without shifting, even steep hills at low speeds. Doing the overdrive swap will improve this, down to 1635 RPM @ 55. Of this 11.4% cruising RPM gain, I hope to pick up 3-4% mpg highway gain, or 1 MPG. Hopefully I will be able to test and know for sure soon.
Following that work, future plans for the vehicle include substantial aero mods and differential gear swaps (4.10 to 3.42) and my eventual goal is to be over 30MPG with this vehicle consistently.
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