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Your tires may be part of the problem.
In a Grand Cherokee discussion, bigger tires meant worse highway mileage and MUCH worse in town mileage.
If the tires are wider also (usually are), it really has a negative effect.
Changes the effective gearing.
Drafting works, but the front of your unit will get beat to he!! from small rocks, sand, etc. Surprisingly, the truck's mileage will also impove slightly. Not v. safe.
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