With petrol direct injection, the fuel is injected directly into the combustion chamber at a maximum pressure of 150 bar. A special combustion chamber geometry ensures an optimum swirling of the fuel-air mixture. FSI is an innovative engine technology from Volkswagen that delivers outstanding thermal efficiency and above-average fuel economy. With an appropriate driving style, FSI engines consume up to 15 percent less fuel than engines with the same power output fitted with conventional injection technology.