re: Nitrogen in tires?

It's often used in race cars because nitrogen pressure is more consistent than normal air pressure, because air typically contains different amounts of moisture on a given day. Water causes air to be inconsistent in its rate of expansion and contraction.

A 1/2 lb. or even 1/4 lb. of pressure in a tire can have a huge impact on how a race car handles. Using nitrogen helps make the adjustments consistent.

It's a horseshite money grab for passenger cars. Just saw a dealer added sticker that included $89 for "nitrogen treatment". Please.