well no one can have that much avarage on any civic in karachi,
the reason is traffic plus the cars eat extra fuel, or the Gas it self.
people get 80 to 100 in a 55kg cylender over here,
there are 3 CNG cars in my house,
Another friends with civic say he get 80 to 90 km/cylender,
I am more then shokced that how come u guys can get this much low consuption on CNG,
All i can say this most be because of climate diffrence and good Gas,