Originally Posted by cleung' post='967693' date='Aug 6 2009, 01:49 PM

In extreme cold temperatures (like in Canada) the expanding and shrinking of "regular" air is noticable (will trigger tpms sensors) so this is where the nitrogen is useful. With nitrogen in the tires the shrinkage is much less and therefore no tpms warnings. For all those people that are saying that nitrogen is useless, you are all probably living in warming climates where temperature does not fluctuate enough to make a noticable difference. But in terms of whether or not it is worth $75 that is up to you,