Up to 20 percent of the fuel consumed in a vehicle merely serves to overcome rolling resistance. It comes as no surprise then that automakers have a keen interest in reducing rolling resistance. The math speaks for itself: Reducing resistance by 30 to 40 percent would lower fuel consumption by roughly eight percent. For a car consuming an average of eight liters of fuel per 100 kilometers and traveling 25,000 kilometers per year, that translates to a savings of 160 liters—and a real relief to your wallet.
This accounts for the past few decades of extraordinary success for the Silica/Silane-system from Evonik, which utilizes a combination of ULTRASIL® (precipitated silica) and rubber silanes such as Si 363® to reduce rolling resistance significantly. The most recent success story has come from POLYVEST® ST, an additive developed by Evonik that reduces rolling resistance even further—without lowering wet grip or increasing wear. In so doing, the Evonik researchers have repealed a fundamental law of the tire industry: the notion that improving one of the three core properties of a tire—rolling resistance, wet grip, or roll resistance—necessarily compromises of one of the other properties.