My theory is that you're going to eventually be on the news after you blow yourself or somebody else up.
There's no reason any of those gases would pull any measurable heat out of your tires any more than the nitrogen would, and it also seems kind of irresponsible to test your theory on the road with no idea how those gases react with the tire material under heat & load, while pulling trailer loads of welding equipment. You could probably keep liquid propane in a tire, buy I doubt that you'd really want to drive around on it
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