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Yeah i think the dude is a little bit sick. He has created around 50 Nissan groups for each car (nissan bluebird, nissan pulsar bla bla).. he doesn't like any other models.. Only Nissans.. so his world IS nissan.

I vaguely remember that Lakshan VZR / Nismo gunawardhana guy commenting about Nissans on that famous motor mechanics FB group, gave me the impression that his world is literally rotating and revolving around Nissan.

Old question, adding an answer for future reference. The most common issues of Nissan Neo-Di engines (QG18DD, QR20DD, QR25DD, VQ25DD, VQ30DD ...etc.) are: 1. Faulty injectors which are fail to hold the pressure. Cleaning injectors are completely useless on these engines. 2. High pressure fuel pump failure due to leaking seals inside the pump or low fuel pressure due to worn plungers. 3. High fuel pressure due to a blocked or faulty fuel regulator. Hard starting after warm up, uneven idle, increased fuel consumption and performance issue are the symptoms of these fuel system issues. These issues can be easily identified by looking at fuel trim data and fuel pressure through a scanner. Normal fuel pressure on a QR engine is 6.00MPa at idle and 10 to 11.00MPa at 2500RMP. The pressure should be relief after shutting down the engine. If the fuel regular is blocked, it will be hard to start or throw the error P1232. In your case what was the issue with the pump? Low fuel pressure, high fuel pressure or mechanically failed fuel pump (leaking oil, - gasoline separation seals are mixing gasoline with oil or worn plungers)? You have to diagnose the issue correctly and order a pump online if it's faulty. Look in Russian federation. PS: If you have carbon fouled spark plug or more, it indicates that the injectors are leaking and need to be replaced. If you notice a strong gasoline smell from the oil filler neck, while warming up, that indicates a faulty fuel pump seal. Loss of power may indicate pressure issues.

We are having 2015 model and in heavy traffic conditions it does only 8/9 KM per liter even with careful driving. However, we twice visited to Anuradhapura and it did 19 & 21 km/l.

Depends on how you drive. If you are gentle on the throttle, it delivers excellent fuel economy. However, if you are a heavy footed driver who wants it to perform like a 1500cc car, it will give worse fuel figures than a 1500cc car.