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Ecky's advice is spot on. At 17 MPG you are very close to EPA highway. Don't waste your money on "tuning" your Subdivision (what Frank calls them). Sidewall max for inflation and precision driving techniques might get you another couple MPG but after that there are no miracles. Considering your driving environment and towing several tons occasionally you are pretty close to maxed out for efficiency right now.
regards
Mech
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