We actually left Casper as planned - very early - to beat the thermals. We had a great day of flying. Note: I got an oxygen tank and system while at Oshkosh, and used it a fair amount on the way home, but especially this last day. We flew at 13,000 ft. again to clear the southern Tetons, and stayed higher than we would normally fly to find smoother air. The oxygen made a phenomenal difference in how I felt at the end of the day. I felt great and not tired, as I had been going. We made a stop in Riverton after 1.1 hours and ate breakfast. They have a nice restaurant there and is probably our second favorite airport this trip. It has a western theme with trophy animals on display on the walls, and is a fun place to stop.