From old days shop dry air is used to inflate the tires for various automobiles. Now days Nitrogen is an alternative of shop dry air. This study shows us a number of advantages of Nitrogen over shop dry air. Literature review suggests that there was considerable improvement in fuel economy, tire tread wear, and tire life. The reason for this is that the shop dry air has small molecules in comparison to Nitrogen molecules, shop dry air leaks in more quantity than the Nitrogen in the same time period. Nitrogen decreases deterioration of rubber which affects tire life.