how about 1-4mpgs? It really depends on a lot of factors and every truck will be different. Even a similar truck with 3.73s and the 4.0 may get different numbers. But most likely changing from a 29" tire to a 31" tire should maybe kick u down 2 mpgs if that.
Note this is from my experience with vehicles, not empirically supported data.
Also sorry for the misunderstanding of the whole 15 to 16" rim thing (didnt want to make you, or me, sound stupid).
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