SmartWay measures NOx emissions and fuel savings potential of tires based on tire manufacturer data as well as EPA testing and research. Michelin now offers 10 tires in its product lineup that are recognized in this way by SmartWay.
The tire maker also noted that a recent 383-pg. report issued by the Dept. of Energy’s Oak Ridge National Laboratory has confirmed that "wide single tires, like Michelin X One tires, are more fuel efficient than duals on heavy trucks—to the tune of 6% overall and 10% with a fully loaded tractor-trailer."