New Rear Gears

I checked the calculator and the difference at 65 mph between my old 245/60/14 with the 3.23 and the new Nitto 275/60/15 with a 3.73 is 161 rpm -2852 to 3013 - and with a 3.91 its 307 rpm 2852 to 3159 so yeah I think I can live with either one . The 2 pig idea is for cruising long distances then swapping for a few days while I'm there then swap back for the cruise home , the 3.23 just doesn't have the oomph around town with the big tires .