I opened this topic to tell you your car's fuel consumption.
I'll start with my car.

Buick Rendezvous 4WD CX from year 2006 it is a SUV.
Car engine capacity: 3491 ccm (211,95 cubic inches).
Car max power: 198.00 PS (145,27 kW or 194,03 HP) at 5200 Rev. per min.
Car fuel: gasoline.
Car fuel with highway drive: 10.2 litres/100 km (22,88 miles per gallon).
Car fuel with mixed drive: 11.8 litres/100 km (19,90 miles per gallon).
Car fuel with city drive: 13.1 litres/100 km (17,91 miles per gallon).
Car fuel tank capacity: 68.0 litres (17,88 gallons).

What about your car?