Our car tires have all nitrogen in them, because we bought the tires at TireDiscounters and they include it for no extra charge. I think the main benefits for street use are that the tires lose pressure slower than with regular air, and the electronic tire pressure sensors inside the tires corrode slower if you plan to keep the car for 20 years.
My motorcycle tires have regular air and the little ceramic balancing beads inside of them. I think the tires lose air slower than with outside balancing weights, because there is ceramic dust generated from the rolling beads that fills tiny air leaks.
“Do…not waste time protesting the self-inflated showmen and bloviating bullshitters who populate our culture. It’s more fun to marvel at them, to appreciate them, to be grateful for them, and to mock them relentlessly. ”-from the 2010 book American Freak Show by Willie Geist. "He wondered what difference any of it would make two hundred years from now." -from the book Cyclops by Clive Cussler.