What is the fuel consumption?

Our van’s fuel consumption/mileage is the following:

• Happy 1: approx. 6-7 liters/100Km. Fuel tank size is 60 liters.
• Happy 3: approx. 8-10 liters/100Km. Fuel tank size is 100 liters
• Happy 4×4: approx. 9-11 litres / 100Km. Fuel tank size is 80 litres