Depends upon many conditions such as driver's foot, how frequent one applies brakes, rush, speed, idle running, fuel, ac, tire size, vehicle's health etc.
However minimum average of the oriel prosmatec i get in the city is 8 and maximum 11.5 (hi octane mixing). The minimum avg on long is 12.5 and maximum 17kmpl.
sent from my Samsung Galaxy S6 edge+