Specifically developed for the European market, tested and proven in the toughest of conditions from the Arctic Circle to Southern Europe, the innovative BlueEFFICIENCY Power drive system technology is used in Citaro regular-service buses. The powerful, efficient Euro VI engines guarantee incomparable economy. That's because, despite higher requirements, they have succeeded in further reducing fuel, engine oil and AdBlue consumption. In a Dekra test the Citaro Euro VI with a Mercedes-Benz OM 936 h engine and 220 kW (299 hp) went up against the Euro V predecessor model with the OM 906 hLA (210 kW/286 hp) and OM 457 hLA (220 kW/299 hp) engines. The result: the developers reduced consumption by 8.6 percent. At the same time, the reduced consumption also eases the burden on the environment due to the associated reduction in CO₂ emissions.