Germany, March 20 -- Sustainability is an important topic for Mercedes?Benz and Setra: The buses from both leading brands comply with the strictest emission standards and in practice their emissions are often considerably lower than the maximum permitted levels. Not only the environment and society profit from low and in turn resource-conserving fuel consumption, but also the bus companies themselves. The independent jury for the international "busplaner" sustainability award acknowledged these efforts: The Mercedes?Benz eCitaro and Citaro hybrid as well as the Setra TopClass S 531 DT double-decker bus had all been entered into the competition. All three won in their respective category - three nominations for the buses led to three victori...