My 2008 Nissan Patrol 3.0-litre CRD gets on average 6 km/l (16.5 L/ 100 km) whether I'm driving around town, cruising on the highway, towing the camper trailer on the highway at 95-100 km/h, whatever. It's stock except for a snorkel, has standard size tyres, is serviced regularly, and has 94,500 km on the speedo. A few diesel experts have told me I have asked that it's normal for the CRD. It's had all the sensors, diagnostics etc. checked and all have been given the all clear. I'm at the end of my tether. Any ideas would be appreciated.
The claimed fuel economy for your Patrol is 11.8 L/100 km on average, which is of course just a figure provided for comparison purposes and as we have found out isn't necessarily a very accurate indicator for real life economy. One carmaker has told us that their real fuel economy number could be as much as 50 per cent out. On that basis yours would fit within the possible bandwidth of fuel economy on the Patrol. Check the exhaust to make sure there isn't a partial blockage that might be restricting the flow.