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It slows down the process of the tire loosing pressure. Some people say it works others say it doesn't. My opinion is just put more air in your tire. If you live in a cold climate and the tempaurature drops 40 degrees over night you will loose 4 psi's. Temparature goes up the next day and than goes down 40 dgrees the next night you will loose another 4
psi's.

Every time the temparature goes down 10 degrees you will loose 1 psi.

Just as easy to fill up your tires every couple of days! I know some places won't want to work on a tire that nitogen in a car's tire.

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Theres not much of a difference for normal driving. Having properly inflated tires is far more important than whether its regular air or nitrogen.

It's used in racing applications because pure nitrogen can be accurately predicted in terms of psi given temperature changes. Since they know the consistency of the gas in the tires, they know how the psi is affected by temperature.

For regular purposes, it doesn't matter if you use regular air *which is mostly nitrogen already anyways* or pure nitrogen gas

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Like the others said, it makes next to no difference. Here are the claims:
1-Less loss of air. Minor plus, tests show a very slight difference over a year, you should be checking tires every month, anyway.
2-Better economy. Nonsense, both nitrogen and air act identically as far as mileage is concerned. Only reason someone might think it's better is because they're finally paying attention to tire pressures.
3-Better ride. Nonsense, again, given equal pressure.
4-Race cars/airplanes use it, so it must be good. Not true for us. Race cars use it to precisely control pressures to the fraction of a psi, not something we do. Airplanes use it to eliminate a potential fire hazard (high pressure air).
Major downsides are cost (not worth a dime), and the problem it creates keeping tires properly inflated (not available many places).

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Your friend is wrong. There are absolutely no benefits of nitrogen related to normal use. Tires do wear out because of air inside, they wear out from wear (surprise) or from ozone and UV degredation of the outside of the tire. They make absolutely no difference with mileage, people may notice something because they just got their tires inflated, and they were low before. Nitrogen is used in race cars mainly to reduce the risks associated with fires (eliminates a source of oxygen). Consumer reports checked the claim that tires leak less with nitrogen, found that after one full year the difference was about 1 psi. You should be checking your tires way more than once a year. A major disadvantage of nitrogen is that people might not put 'plain old air' in their tires when the tires are low, leading to extra tire wear and, potentially, a blow out.

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