There was another story this week in the electronic version of Tire Business that mentions proper tire inflation as a major factor in fuel efficiency and tire life. This one had comments from the American Oil Change Association (AOCA) and Continental Tires. One interesting quote: "Every 1 psi under the optimal inflation pressure shaves 0.4% off a vehicles mpg." Consider an air filled tire loses 2 psi/month, and an oil change interval of 3 months (when the tires are topped off again). After 3 months, you have robbed your vehicle of 2.4% of its mpg. Tires filled with nitrogen take 4-6 months to lose that same 2 psi. Using nitrogen tire inflation to maintain proper tire pressure between service intervals increases tire life and maximizes fuel efficiency.
When you consider that 25% of passenger cars and 32% of light trucks have at least one SIGNIFICANTLY underinflated tire (by 25% or more), and that 85% of the population doesn't check their tire pressure regularly, the benefits of nitrogen are realized quickly by most consumers.