The sticker on my 2009 turbo-diesel Nissan Navara King Cab auto quoted 9.2 L/100 km and I thought 11 or 12 would be acceptable, but the best I have achieved in the 35,000 km I?ve done in it is 16.8 L/100 km with the average being 18 L/100 km. The Nissan dealer has checked it and says all is in spec. They claim that the dealer-fitted bullbar is part of the problem. I am 60 years old and drive like most old farts, but this one takes the lemon award hands down.
Clearly the consumption is much higher than you would reasonably expect, and while the bulbar might cause a small increase in the consumption it’s not likely to have that dramatic affect. Take the vehicle back to the dealer and ask them to check the consumption themselves to confirm what you claim it to be, then ask them to find the cause of the high consumption. If necessary call Nissan in as well, and if all else fails go to tell them you want your money back as they have not provided you with a car that does what they claimed it would do.