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Discussion Starter #1 (Edited)
Recently took a trip from FL to TX towing 5500 lb. trailer(25 ft. camper). While the truck preformed very well we got about 9 to 10 mpg. the trans continually shifted between 7th and 8th gear. (running between 60 and 65 mph). setting the gear limit to 7th gear dropped the mileage even lower. Without the trailer this truck will get between 20 and 22 mpg.
12 to 14 mpg would be great.

Would taller tires (I have 275/65R18) help?
would trans tune chip help?
 
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