Some mechanic's people advise also changing the oxygen sensor(4 pieces-150 dirham each!!!) and only genuine spark plugs,air and fuel filter,and trotthle sensor (170dhs) also need to change.
Some ingector cleaner (which not reccomended by Nissan factory) NO NEED to USE!!!
One man from Russian forum told me that his Pathfinder (R50,3.3) eating 30-35 liter per 100 km!
I think this problem have all 3.3 and 3.5 engine(QX4/Pathfinder models),if we will change every thing,what's requaired for reduse fuel consumption - it will be half car price!!!