I believe that the gas used to inflate tyres is simply compressed air in most cases, but they can also be filled with Nitrogen which is supposed to be less prone to heating up than compressed air when tyres are subjected to harder service eg: long distance, heavy loads, high speed.
Air is 78% Nitrogen. The benefits of 100% Nitrogen, for use on a normal road car, are minimal. All the traces of Oxygen and other trace elements would have to be removed, before adding pure Nitrogen.
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