Nitrogen is better because it does not expand or contract as much as regular air.
when you drive, your tires get hot from road friction, this causes the tires to gain pressure. When it gets cold outside, you can lose up to about 8 psi in your tires, having nitrogen would minimize the difference to about 3 psi.
If your not racing, or offroading heavily, you would never know the difference. Just add air when its cold and let a little out when its hot. I wouldn't spend the time and money to get notrogen for a street vehicle.
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