Originally Posted by fourliter dan
no its not, its a better solution to air. it lasts longer and has been said to help milage...i doubt that its true abot the milage.
We're joking. Nitrogen doesn't change volume as much as air does, so they pump it in yoru tires so that they're the same PSI on a 90 degree day as a 20 degree day. Err, close to same PSI