Addding nitrogen to tires

I can't remember where I read it but someone did a long term test on the whole Nitrogen vs. Air thing and determined the straight air lasted 97% as long as the Nitrogen. So where you could run your Nitrogen tires for 100 days you'd have refill the air filled tires in a short 97 days :)

This topic brings a whole other dynamic the old cliché joke about having the mechanic telling the unsuspecting consumer that it's time of change the air in the tires.