I've never heard of this before. Apparently Costco is providing this service.
Why Nitrogen? Check here and here.
Interesting...
Someone else's rationale:
"Pure nitrogen (N2) has a molecular weight of 28.01. Air is roughly 21% oxygen and 79% nitrogen --> average molecular weight of 28.85. Hardly a difference you'll see in real life.
The main benefit of pure nitrogen over air is that air used to fill tires is not dried air, thus it contains a fair amount of water. Thus, your tires heat up faster with air than with nitrogen. In street driving this means very little as you don't drive your car anywhere near hard enough to see a difference. In a race car, you are driving the tires to death and they will get dangerously hot. Nitrogen helps reduce that risk."
Why Nitrogen? Check here and here.
Interesting...
Someone else's rationale:
"Pure nitrogen (N2) has a molecular weight of 28.01. Air is roughly 21% oxygen and 79% nitrogen --> average molecular weight of 28.85. Hardly a difference you'll see in real life.
The main benefit of pure nitrogen over air is that air used to fill tires is not dried air, thus it contains a fair amount of water. Thus, your tires heat up faster with air than with nitrogen. In street driving this means very little as you don't drive your car anywhere near hard enough to see a difference. In a race car, you are driving the tires to death and they will get dangerously hot. Nitrogen helps reduce that risk."
