I've gotten some bad bump steer ever since i added the 1.5" autospring on top of my rancho lift and i was wonderin what could do to get rid of this. will fabtech's steerin stabilizers help?

And also i was wonderin if i got 4.11 gears how my gas mileage would be effected in the city and the highway compared to my 3.73's

 

Since my 4.88s have improved my gas mileage in both and I'm on 37s, I think its safe to say that it'll be the same for you. Check your PMs.