Another great leap forward for the global bestseller among regular-service buses: the Mercedes-Benz Citaro has just extended its lead over the competition with a completely new engine generation. This makes the Citaro the first regular-service bus to be fitted and supplied with Euro VI engines as standard, and the world’s cleanest-running diesel regular-service bus. A raft of further innovations have reduced fuel consumption and CO2 emissions, successfully offsetting the extra weight involved in meeting the Euro VI exhaust emissions standard.