Hi all, first, sorry for the language as I don't speak German. 
I'm following this forum for some time now and I bought used Mazda with 7000 km. Yours and some other forums gave me a last "push" to buy the car. So far no regrets. 
I decided to join the forum and share my consumption numbers.
Situation:
- 55 km drive to work to Ljubljana, 110 km per day,
- 95 % autobahn with 130 km/h on average with ACC
- crosing 4 tunels, few kilometres with 110 Km/h on average
Average meausered consumption (computer is showing 0,4l lower consumption) is: 5,85l; 6,18l; 6,00l; 5,92l; 5,86l; 5,94l; 5,63l. I'm very satisfied with the consumption so far.
All the best
Bojan