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As a general rule, larger tires give better rolling resistance provided you keep the same inflation pressure. However, you may find that you need to drop the inflation pressure in order to keep the truck from bouncing - and there isn't any data to tell us what happens when you do that.
Nevertheless, the larger diameter is going to help change the gearing of your truck in the right direction. Given how many miles you drive, it jjust might be worth looking at changing the rear gear ratio. That obviously is not helping your fuel consumption.
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