Now we have had the car long enough to know more about how much it does consume.
On short tours and mostly around in the city with hills up and down it is a bit more than 7L/100km if following the traffic flow.
If not feeling too ashamed about delaying other traffic, and occasionally having somebody honking the horn at us, it can get down to a bit more than 6L.
On longer trips on highway and mostly flat areas no problem getting it down to around 5L which is as good as a Golf 2.0tdi DSG but far more comfortable.
Having a card to BP we have been using their fuel until lately when I read somewhere in this forum, that Shell has something in their gasoline that cleans the engine, so tried that. Do not know if it is correct or just a coincidence but it seems that the engine (gasoline) is making less noise. Will continue with Shell a while to see if it is correct or not, but one thing is true: the gasoline from Shell smell very different to the BP gasoline (both 98 octane).