because in my book...MPG wins the day....with rates the way they are and no sign of getting better..you need every MPG you can squeeze outta that sucker....Yeah, I had already talked to Wayne about that and what needed to be done. He has the rims and only minor change to accommodate the larger tire size. Biggest cost is just the new tires. I was going to do it when I had to buy 2 tires last year, but changed my mind. Wishing I would have stuck with that plan now.