Salam,
If you're getting an average in between 11 - 11.8 then it's perfectly fine, still if you have resetted the meter give up sometime it would increase itself, go easy on pedal and try to drive above 40 for short trips, drive at a speed that is easy to control most probably 60 or more as this would increase your fuel efficiency. Go easy on brakes while driving and yes if you are refuelling dont refuel it till full the point until average becomes a little bit better, I would suggest you to fuel if upto 2000PKR max for sometime.