A month ago when I got my tires/rims switched back to summer, I was waiting and noticed a brochure on nitrogen. I read it and asked the guy at Fountain Tire about it. He said it was $39.95 to have it done and free top ups for life. I told him I'd think about it and went home and went on the net to find out more. Seems like all race cars use it and a lot of sport car enthusiasts. It has a lot of benefits, so when I went back to have my tires tightened I told him I wanted to have the Nitro. It was a different guy and surprise, surprise, he did it for free. Any one here have it? Any benefits that you've noticed?