"Since you are so knowledgeable about nitrogen, maybe you would like to explain why all jet airliners use pure nitrogen in their tires, as well? Tires that must achieve 200 mph on a daily basis.

I do agree that running cooler is not the reason.

Still think it's cheaper than compressed air to fill ten of those babies?"

I don't have to explain it. I never said they did, and I don't know what they fill them with. I just finished explaining that in a situation where you are away from the shop and away from your air compressor, nitrogen cylinders are a cheap, convenient, clean and quiet alternative to a gas powered portable compressor. Perhaps the explanation is that it is more convenient to inflate the tires from a service truck than to tow the aircraft back to the hanger when the tires are low.

In fact it is a lot cheaper and more convenient when you add up the cost of a gas powered air compressor, the fuel to run it, and the time and expense of servicing it. That's why racers started using it 70 years ago.