Nitrogen in the tires

I love learning new things and this is a new one to me even though I'm sure it's been out for a while. Just recently heard from a buddy with a 07 ram 1500 that he is running nitrogen in his tires, says the ride feels better, better gas mileage and so on. I was wondering if any one here runs nitro in the tires or maybe I'm the only one that doesnt. Is it worth it? Is it expensive? and how do you get it? My buddie with the ram goes to a Ford dealer to get his tires aired, me, I dont think so.
Author: sweeperking