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Uhhhh .... air that you breath is about 78 percent Nitrogen .... you can put it in your tires whenever you want.
This "Nitrogen fill" crap is justa way for tire shops to make money off you. Unless you're a race car driver where a 1/4 pound of gas pressure is CRITICAL to whether your car oversteers or understeers through a corner ... tell the "Nitrogen fill" Bozo's to eff off and just put air in your tires.