FYI the big sell of nitrogen is safety related.
Mainly because it reduces the chance of driving on tires with dangerously low pressure.
Nitrogen molecules are much larger than oxygen, and cannot "seep" out through the tire rubber like oxygen does. SO... the tires stay properly inflated for much longer/indefinitely...
It may also be less affected by tire heating, but seepage is the main reason it gets "pumped" so much.
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