Traditionally, car tires have been filled with compressed air. Air is 78 percent nitrogen and just under 21 percent oxygen, ...

But will you get better gas mileage if you inflate your car's tires with nitrogen instead of compressed air? That's one of the claims of advocates of nitrogen inflation systems, like N2Revolution ...

The improved automatic tire inflation system can enhance tire efficiency ... high implementation cost & configuration complexity and nitrogen tires substituting compressed air tires.

Proper tire inflation pressure is the objective ... percent nitrogen purity in the tire—the claimed limit of our nitrogen ...