Fuel remaining was less than a quarter tank.
Filled it with around 30 liters of Hi-Octane, after using for 550 km, car meter showed mileage of 19.6 whereas in reality when i calculated mileage i got average of 19 km-pl.
In previous cases when Regular Petrol was used in car, after using for around 450-500 km, car meter showed different mileage reports of 19.3, 19.5 km-pl and when Average was calculated it gave around 0.1 to 0.2 more than what was shown on car`s meter. It gave average consumption ranging from 19.4 to 19.6 km-pl respectively.