I always have nitrogen refilling on my car tires. I think the major benefit is that I can avoid frequent refilling as it lasts for more than 3 months or so. It gives stable air pressure as nitrogen is less likely to migrate through rubber. So it can ensure consistent inflation pressure which is good for a safe driving. That is why racers insist on having nitrogen than having normal air. Another thing is that you can save money and time as it doesn't need frequent refilling. Do you insist on having nitrogen on tires?