When you replace the air in your tires with nitrogen you will save approximately 10 percent on your fuel usage. Your tires will run cooler and there will be drastically less pressure fluctuation and friction created. Your tires will run cooler and more efficiently with less drag and wear. It cost me $40.00 for the nitrogen and I get my tires topped off for free by my dealer if and when they need it. For more info go to www.getnitrogen.org and calculate how much money you can save!