The consensus from other forums is that nitrogen in tires is mainly hype, that is, if you check the air pressure in your tires regularly (at least once a month), there is no real advantage to nitrogen over air.

However, if you live in an area where temps fluctuate (like here in Mich), and you don't check your tire pressures (like my oldest daughter), then it may make sense to use nitrogen for tire pressure stability (like she does in her Jeep).

Most local tire shops (e.g., Costco) and dealers here offer it for free.