Our best just got better. The MICHELIN X LINE? ENERGY Z tire is guaranteed to deliver 20% more mileage vs. leading competitor line haul steer tires* and 5% better rolling resistance than the MICHELIN XZA3+ EVERTREAD – 20% more mileage guaranteed vs leading competitor line haul steer tires.*- 5% better rolling resistance than the ultra-fuel efficient MICHELIN XZA3+ EVERTREAD tire.*- Get more mileage without compromising fuel efficiency with the patent-pending Dual Compound Tread.- Even wear to the end of tread life due to directional miniature sipes in the groove walls (directional to half life).- Approved for use on EPA SmartWay certified equipment and meets California CARB requirements.- Maximum retreadability backed up with a 3-Retread Manufacturing Limited Casing Guarantee: 3 retreads or 700,000 miles or 7 years for the MICHELIN X LINE ENERGY Z tire when retreaded by an authorized Michelin Retread Tec