If you decide to go with the 315's please post back in a few weeks with your mileage reduction.
I'm going back and forth on a couple of wheel and tire combinations and yours is one that I am considering.
Congrats on the Jeep!
Black Forest Green 2012 JKU Sahara - Used to love her, had to trade her.
Rhino 2016 JKU Rubicon Custom. MT, 3.5" Metalcloak Lift, Metalcloak Full Width Front Bumper, Atlas Rear Bumper, 315/70/17 Duratracs on 17x9 Warlords