Other factors that can affect how much petrol a car takes include the efficiency of the car's engine, the driving conditions, and the driver's habits. For example, a car that is driven in city traffic will use more petrol than a car that is driven on the highway. A car that is driven aggressively will also use more petrol than a car that is driven conservatively.
If you are unsure how much petrol your car takes, you can check the owner's manual or consult with a mechanic.