[chutrain]

Nitrogen tends to maintain pressure better over time and no influence by temperature, so a track situation, the benefits are better exploited. However, for normal daily driving you are better off using regular air. If you do not have an air compressor, you can fill up at any gas station. You won't have to worry about finding a shop that can fill.

But keep in mind, once you introduce air to a nitrogen fill you will need to have the the wheel and tire combo reprepped if you go back to nitrogen. They will need to completely remove all the air and then refill with nitrogen. They will charge extra for that.