The president of the Board of Directors of the Volkswagen Group, Martin Winterkorn, made a forecast on the propulsion technologies of the future in the International Motor Symposium of Vienna . The work areas in which Volkswagen will focus include the development of a high -performance diesel engine that delivers 136 hp per liter of cylindrated and a new 10 -speed double clutch gearbox that reduces fuel consumption. Among the alternative propulsion systems, it is the plug -in hybrids that offer greater potential.