On our Facebook page, we recently posted that you can improve your gas mileage by up to 3.3 percent with properly inflated tires. It's a good idea because driving on tires at the appropriate inflation level is safer as well as more economical. And to ensure your tires keep that fuel efficiency, you should also consider inflating them with nitrogen. As a dry, inert gas, nitrogen doesn't expand and contract with the temperature like oxygen does, so it maintains your tires at the right PSI longer than compressed air. You can find out more about nitrogen inflation here: http://freeservicetire.com/nitrogen-tn-va.