Well Jimmy, I was also hoping for better MPG's, but I guess considering the added weight and drag as a result of larger tires and lift, I guess is expected. Especially your truck, beena 4X4. My gear experience, has not been a good one. First, I had to take the axle apart twice because the shop setup the new Yukon 4.88's incorrectly, and were making noise. After the second setup attemp, I still have a slight gear whine between 25mph and 15mph on deacelleration. I was really looking foward to have the new gears installed, but after the worthless setup job I got, Well every time I drive the truck, I get reminded of what an "improper gear setup" sounds like. To get the gears fix, it would at least cost an extra $300.00 to have ZUK do another setup and that is assuming my gears are not shot. I'm still debating on whether or not to take the gears apart again. If I do, it will during the fall, I need my truck now to tow the jetski to the lake. Hey congrats in advance on your upcoming wedding!