Yes, that is about the long and short of it. You are driving a two-tonne car with a Cw value that is about the same as Canterbury Cathedral and a considerable front surface using a petrol engine at speed.
Most of us do a bit better, but you are not quite used to the car yet. I usually get about 10-9.5 l / 100 km on long motorway runs, driving about 130/140 kph.
It may be that conditions were adverse, Headwind, using the heater or airconditioning, tyre pressure , hilly roads, etc. may push the value down.
Driving style is of great influence, maintaining a constant speed and feathering the accelerator helps a lot. The Power dial is quite informative, the deeper into the green, the better.
My advice on long runs is not to worry about fuel consumption, but to enjoy the exceptional smoothness and silence of the car.
The technology is aimed at pottering around in the suburbs, making use of the space, high driving position, maneuverability, 4WD, electric drive, and so on.