I don't think you got a dud.
Please let me explain, and I mean no offence to you.....
When I drive the Kluger locally (to the shops, work, school etc.) I can get the fuel usage to sit in the 12 l/100km range. When the wife drives to the same places, I get the Kluger back showing in the 14 l/100km range. It doesn't matter which of our cars she drives, her fuel economy is crap, whether it is a TDI VW, petrol powered car. So I think it is your driving technique.
At this point I must point out that I think my wife is the best driver in the world. Approx. 20 years ago my wife was driving our old Toyota shovel nose Corona, and I was a passenger kindly giving her some advise on what she was doing wrong. She slammed on the brakes in the middle of the road, leaned over and opened my door, then kicked me out of the car. I had to walk home. Ever since that day, I have come to the conclusion that she can do no wrong with her driving skills, and she is a better driver than me..........But she cannot drive a car economicly.