I suppose you are all correct that it's very optimistic. I'd be happy at around 14-15 mpg, okay at 12, a bit dissappointed if its at or below 10, as that is very far from what I have been led to believe of the newer ategos. I'm looking to be dissapointed I guess!
However the truckers report about 10 mpg with the new Actros trucks of the largest kind, that have engines almost twice the size and haul 3-4 times the weight. I'm led to believe a lot has happened to diesel consumption from a 2007 to a 2013 Atego, and it's going to be exciting what it really is.