Are you taking the figures from the OBC? Don't reset it and after awhile, it should provide you with a near accurate figure.
People often reset them before making a short trip around a town or city. Then they wonder why it's so low compared to the book figure's combined average for MPG.
How fast do you drive on motorways? I have a FL1 TD4 and if you drive much over 70 mph, it will drink an awful lot more fuel, probably due in part to poor aerodynamics. Not sure if it's the same in a FL2. I usually drive at 65 mph. (70 mph according to my speedometer, but it's out by 5 mph)
Imo if you drive an SUV style vehicle, you should not drive it like a saloon car if you want to get the best out of it, nor should you expect it to perform like one.