Today I manually calculated the AVG.
The needle is almost at empty.
ODO reading is 691 Km.
Fuel amount since Day 1 =Rs 3800
Rs 3800/Rs 73=52 Ltr
691/52= 13.2 Km/l 
And the AVG reading the car is showing is approximately same (~13) .MashAllah great fuel consumption.Totally satisfied 
Car is 40% driven on long and 60% within city.with 25% A/C.