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I have an 08 mega cab, and when I checked my speedo with the stock tires with my GPS, the speedo was showing 2 mph over actual.
I just mounted some BFG mud terrain KM-2s (285s) and they made the speedo close to perfect with the GPS!
It would seem that the slightly taller tires yielding effectively a taller final drive ratio, would give you a MPG improvement at highway speed.
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