Page 138 of the owner's manual states that you will get "excellent" at level 3. That's anything better than 6.8L/100. You are doing very well.
I live in Vancouver and averaged 6.3 on the first tank and I am now at 5.8 on the third tank.
By the way I recommend you read the owner's manual. This is not an ordinary car and I have found a lot of features in the car that I wouldn't have known about. I am still reading it.