After installing New Tires You may experience a reduction in your Vehicle's Fuel Efficiency. The Tire Tread of the New Tire has more Rolling Resistance than Tires with Worn Tread. Rolling Resistance is the amount of energy you need to transfer to the Tires to keep the Tires moving at a consistent speed. New Rubber in a New Tire is more Flexible and takes more Energy to maintain that Speed. After several warm up cycles of the Tire the Rubber has a tendency to break in and have less Rolling Resistance. Other Engineered components of a Tire can also reduce Rolling Resistance. The U.S. Department of Energy shows that using low rolling resistance tires can have a fuel savings of up to 10%. There can be some drawbacks to purchasing low Rolling Resistance Tires. Low Rolling Resistance Tires can have a shorter Tire Tread Life and may have some Road Noise. Low Rolling Resistance Tires have a different type of rubber than in conventional tires. The Construction is also different. Due to these two Factors you will normally pay more for a low Rolling Resistance Tire.