You wont "like em thick" commuting that kind of distance. Regardless of what gear ratio you end up with that wide of a tire is GOING to kill your fuel mileage. They are extremely heavy and MT's are not the best idea for commuting as they create a LOT of drag. I realize looks matter to a lot of people but I would suggest going with a narrower A/T tire for commuting back and forth. Think 10.5 or 11.5 wide...