I wouldn't want any gear taller than my 3.73's. I've been waiting to trip over a smokin' deal on front & rear 4.10's. 3.42's have no place in a performance truck, IMO.

BTW, I have been able to get 22 mpg (supercharged) on the highway. It was very difficult to drive the speed limit & keep my foot out of it, but I did it.