I'm interested in anyone who has the 3.92 gears in their trucks and standard size tires like 265s. Do you get better or worse mileage? How do you like them overall? How much is a decent price to buy them and have them installed? I called the dealership to get the most expensive so now I'm curious as to how little some of you may have paid. I've read that your RPMs will go up around 200, so does that hold true? Thanks.