We're old users of QG series in many chasis including this one... The max economy we achieved on nissan n16 2006 was from a manual QG18de pulling 12 with ac on local... Whereas QG13/15/16 do 10-12 local & 15-16 local...
I own a QG18de Russian series engine in my Nissan b14,which is automatic it pulls around 11.5-13 local & long 16-19 kmpl. But these three strip ecu's never every give more than 12-13 local economy & 15-16 long economy... So i think our brother has not calculated economy properly...