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Originally Posted by RangerNewbie
But 'air' is not an ideal gas- using pure (98% pure?) makes the pressure predictable. Useful in racing or other hi-performance apps- IMO useless for a street vehicle.
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I'm not sure where you are getting your information, but it's not accurate. Yes, air is an ideal gas at tire pressures and temperatures. And the pressure is predicted to be the same with 80% nitrogen (air) or 98% nitrogen or 100% nitrogen.