- fuel Saving tread compound - The LS388?s Advanced tread compound Reduces rolling resistance, Which Helps boost your vehicle?s fuel efficiency. and when you do that, you reduce exhaust emissions, too. you help save The environment while you save energy dollars - wet grip groove Design - Four wide longitudinal grooves channel road water, while Lateral grooves work to direct it out from under The tire. - high stability centering Rib - The Solid Rib in The center of The tire Ensures straight-line driving stability. - quiet-ride pitch alignment - optimized tread pitch width and alignment quiet Resonance and The road noise it creates.