Those big, wide tires are great for off-road in the mud or sand, but they add a huge amount of rolling resistance on the highway. The combination of the lift and the wide feet adds quite a bit of wind resistance too. The bigger gear ratio, while giving you back some, if not all of the power you lost with the bigger tires and wheels means your engine operates at a higher RPM for a given speed, which translates to more gas used.
However, your truck looks great and I bet it's fun to drive.
I'm sure Bill can write tunes that will improve things, but realistically, I'd expect something in the neighborhood of no more than a 1 MPG increase with your setup.
I wonder if your exhaust is helping or hurting you? There was a thread in this forum a while back where Cody, I think, talked about how exhaust mods don't always give you what you hope for. (But I bet it sounds nice).
- Jack
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2024 F150 Platinum SCrew 3.5L PowerBoost FX4, Peragon Tonneau Cover, LineX Bed, 35% Window Tint on All Sides and Rear, Full Nose Paint Protection Film, Husky Mud Guards, Lasfit Floor Liners, VIOFO Dash Cam
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