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 ...

And when they're inflated, it's not with regular air. Airplane tires are filled with nitrogen. Brandy: Nitrogen is an inert gas, so high temperatures and pressure changes have less effect.

Bartlett This common pitch is compelling: Filling your car’s tires with nitrogen will reduce air loss, boost fuel economy, ...