Bro, the figures are not universal and depend on many many factors (I have discussed them multiple times here on Pakwheels).
Same car, but fuel efficiency will be different in different situations, driving / road conditions, etc.
Nowadays, I am getting almost ~18.5 kmpl due to severe rush, frequent traffic jams on Islamabad Expressway, GT Road, Ammar Shaheed Chowk and onward, etc.