Does anyone else put nitrogen in their tires? I've been doing this for over a year now and can honestly say it has made a difference.
Buy cheap, buy twice.
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Nitrogen stays in tires longer because the molecules are bigger. Nitrogen is also more stable with heat. Your tire pressure doesn't flucate as much from when they're cold to when their hot after driving them in the mid-day sun. I believe that nascar tires are filled with nitrogen for this very reason. I also put nitrogen in my suspension airbags.
If you choose to go this route, buy your own tank and regulator. Firestone down here charges 85 to inflate 4 car tires with nitrogen. I already have a bottle since I do hvac and a refill is 16 and last a long time.
Nitrogen expands at less than half the rate of compressed air when heated, which reduces the surface area of the tire that is meeting the pavement, provided you don't travel far enough to max out the expansion rate of the nitrogen.
We have been using nitrogen in race car tires for years.