This common pitch is compelling: Filling your car’s tires with nitrogen will reduce air loss, boost fuel economy, reduce rolling resistance, and improve safety. Some cars are even sold with the ...

Green-valve-stem caps aren't a fashion choice — they signify that the tire contains nitrogen instead of regular air. There are benefits to this, but it's not always easy to find a place to get ...

We may earn commission if you buy from a link. Why Trust Us? Is there really an advantage to using nitrogen in tires rather than air, such as better fuel economy, a smoother ride, or longer tire life?