How to check economy

IT WILL be about 11.5 litres for 100km in city traffic and about 7.5-8.0 litres for 100km on the highway. You can measure it by first filling the tank and setting the trip meter to zero, then driving normally for a few days and refilling the tank and recording the litres it takes. You then divide the litres you used by the kilometres driven, expressed in hundreds. If your car used 46 litres while you drove 400km, the consumption would be 11.5 litres for 100km.