Here is my take on the situation. Go to 3.73 max. I was running 3.07 gears up until a couple months ago with the 3 speed auto and 35 inch tires. I was happy as heck with my gas mileage. I was averaging about 16 MPG, and on a trip out on the highway I was pushing 19MPG. Everyone told me I needed to regear to get good gas mileage so the engine could run in a range where it was happy. The numbers of 4.56, and 4.88 were tossed around like it was law. I ended up going to 4.10 to get back to stock-like performance using gear calculators. Now I get 13.4 MPG on average and even worse on long trip on the highway. It performs much better off-road but my wife *****es at me constantly about how often I stop at the gas station to the point where I am now looking for a **** box work beater for gas milage.