I have to disagree with the statement that you don't gain anything from 3.92 to 4.10. I did that change on my 07 and it help big time. Out of the hole and city driving. It seemed the tranny was always shifting to early and you have to high a gear for city driving. With the 4.10 it made the truck so much better to drive around town.

Just my .02 cents.

 

Going to 35's or 37's is going to reduce mpg. So is lifting the truck. With both, expect to lose 2 - 3 mpg easily, even with a gear change.