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you could try using a flat angled sheet of plastic from the front edge of the bumper to the top of the grill, maybe clear plastic and youd get you headlights to shine through. also smooth out and fill in the gap between the bumper and wheel wells, throw an airdam on there that covers the front wheels as much as possible, and if you have skinney tires and flares, 4 wheel skirting would help.
though, I dont know how much all that would do. your biggest problems are the engine and drivetrain, neither are efficient at ALL, but then again they are rugged and tough
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