it could be the extra weight your hauling around, I get good mileage becuase a got a short box regular cab 2wd base model. That's almost as lightweight as you can get from the factory, its just i dont got a the 4 banger.

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SOLD:'05 2wd Ranger xl with the 3.0
MODS-Alpine head unit, throttle cable mod, Black Rock wheels, FX4 lvl II axle swap, pooleo's camo painted bezel and mustang dome, painted/aftermarket headlights/tails fold-a-cover and over 100 hp in stickers

'86 AMC Eagle and '01 Grand Prix GTP