Hello from ND, and welcome to Ecomodder.
As far as your truck, with those tires and that ride height, I don't think there's much that can be done to drastically improve your mileage. Not exactly the greatest base vehicle for ecomodding lol. My ex's father is a dinosaur hunter, travels all over the Dakotas digging up fossils and whatnot, and for years he just used his early-90s Grand Prix two door. Beat the hell outta that car, but he dug up a couple-million-dollar near complete fossil with it lol.
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