The First Ecopia Tire Designed specifically for CUVs and SUVs, the Bridgestone Dueler H/L 422 Ecopia offers low rolling resistance without sacrificing performance on wet surfaces. And because of its fuel-saving tread compound, this attractive all-season tire helps achieve better fuel efficiency.Bridgestone's Ecopia technology features two types of compounding that reduce rolling resistance. NanoPro-Tech controls the interaction between polymer filler materials (such as carbon black and silica) and other rubber chemicals at the molecular level.The "Fuel Saver Sidewall" compounding lowers rolling resistance by returning more energy to the tire than a normal sidewall. The result is less heat generation.