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One thing that keeps nagging on me is what those gases will do when it gets cold; condensation may occur and make the tire collapse.
CO2 is unfit for winter use up north as it will condensate at near atmospheric pressure when it gets really cold.
R-404a condensates at room temperature at pressures higher than tire pressure, but not that far off. I don't know the exact condensation point for that but suspect it lies at an even higher temperature than CO2.
It would be interesting to know what happens when you fill a balloon or such with your mixture and put it in the fridge.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
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