I have been keeping record of mine since May, started out using V-Power and changed back to 91ron. I havent seen a dramatic change in consumption between the different fuels to offset the price difference so I have stuck to 91ron. I dont do a great deal of kilometers as I work close to home. I have used 693.93 litres of fuel and travelled 6438 kilometers for an average of 10.778 L/100km which is great for such a large car in my opinion