Developed specifically for Europe, tested and proven under the harshest conditions from the Arctic Circle to southern Europe, the innovative BlueEFFICIENCY power drive technology is used in Citaro city buses. The powerful, efficient Euro VI engines ensure unrivalled economy. In spite of higher requirements, it was possible to further reduce fuel, engine oil and AdBlue® consumption. In a Dekra test, the Citaro Euro VI with the Mercedes-Benz OM 936 h and 220 kW (299 hp) engine competed against the Euro V predecessor models with the OM 906 hLA (210 kW/286 hp) and OM 457 hLA (220 kW/299 hp) engines. The result: the developers succeeded in reducing consumption by 8.6 per cent. At the same time, the reduced consumption protects the environment through lower CO₂ emissions.