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One thing you could look at is improving your air intake and exhaust. This doesnt mean a loud exhaust, just more free flowing. My brother has an 05 2wd 4cyl and he gets about 20 mpg or so. I think you get less because the 4wd is heavier for the 4cyl to push, and has more places to lose power like the transfer case and such. My old 22R 4cyl 87 4wd only gets about 18 mpg, and it always has. Gas mileage shouldn't go up with age, unless things wear and cause less drag, but, that would be bad for your engine. Good luck.
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87 4x4 Pickup
22R 5 speed manual
No current non-stock mods except a homemade bumper :P
Just added, brand new Pro Comp Series 97 Wheels.
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