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Set it closer to the ground and use air bags to keep the rear level when towing. Put the mirror back on, I can't back up our trailer without the passenger side mirror. I also dropped $500 on a set of Michelin X Radials for the suburban. It picked up 3mpgs over the yokohama geolanders I had running on it before. If you do get new tires, make sure to get at least 6ply, 4 sucks on a heavy truck. The best my suburban has hit is 25mpg @ 80mph. Your truck is a chrysler product and I really don't know of many offerings as far as tuning goes.
My neighbor is going through the same thing with his dakota, you get the same mileage as him. I think it's mostly in the computer as to why the dodge trucks have such a hard time getting higher numbers. It doesn't matter what he does to it, it won't get better than 13-14mpg for him. Is yours 2WD?
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