I rotated the gasses in my tires last week. Using a garden hose, I siphoned all the nitrogen out of the left tires, and transferred it to the right tires. Then, I captured all expelled oxygen in two liter pop bottles and put it back in the left tires. When I was done, I measured the tire temperature of the tires while parked. The oxygen tires were 98 degrees, and the nitrogen filled tires were 119 degrees!
Do you think it makes any difference that the nitrogen tires were in the sun, and the oxygen tires were in the shade?
For instructions on how to do this, please send a PM to the folks posting above me.