Green caps on tire valve stems usually mean the tires are filled with nitrogen instead of ordinary air. Car dealers, tire dealers, repair shops and even some gas stations have touted nitrogen for ...

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 ...

not all air is made equal. Moreover, stuff like nitrogen could give you the edge when it comes to monitoring tire temperatures on track. It all comes down to moisture. Regular compressed air ...

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?