Re: FC for 523 LCI
for mine 4 yrs old E46, i took it easy on the first 2000km, drove quite normally. once in a while give the car a full blast. so far everything is fine with my car.
for your FC it sounds pretty bad, unless you are stuck in traffic jams all the time or just floor it at every opportunity, it shouldnt be at those levels. i would normally check tires first, punctured tires eats up petrol. and since its a new car, sent it back to PML.