No, that's at the tire store where they hawk nitrogen fills.

I fill mine with a custom blend. Its about 78% Nitrogen and about 20% Oxygen with the balance made up of various trace gasses. The cool part about this mix is that its available wherever I go. :rolleyes:

I do the same.

I had a short discussion with a guy trying to sell me nitrogen for the tires. What's in there is 78% nitrogen, he starts with 1 atmosphere of that, adds 2 more at ~100% nitrogen, 92.67% nitrogen instead of 78%. Worth how much?

More important IMO is the moisture content, the only real benefit IMO is that the nitrogen charge should be dry, but then what about the air that is already filling the space before the nitrogen pressurizes it?