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I've never used nitrogen in my tires but I've had too many clients over the years say it does cure the fluctuations in tire pressure when seasons change to not believe it doesn't work. They were kids telling me this but older and very experienced car guys.

I was making the same argument the writer made when it was explained to me it had to do with water. There's a lot more in air then there is in nitrogen. That water freeze in cold, taking less space. When it's hot the water heats up and turning into a gas, expanding and raising the tire pressures.

I remembered in summer seeing water come out of the tire stem. It's the only thing that makes sense to me. The one thing all the clients agreed on was they never saw the temperature fluctuations after using nitrogen in their tires.

I keep meaning to fill my tires up with nitrogen but never get around to it.