^ What he said but also never trust any quoted figures.
IMO it is far better to read magazine reviews and look at their figures they got as there much more real world.
My own fuel figures i would also only ever go by brim to brim of the fuel tank figures not what the MFA says. As i can get real low figures and real high figures watching the MFA but my average to a tank over the past year has veried very little.
Basically fill the tank till the pump cuts off. Reset your trip meter. Then drive as you would normally till the tank is more or less empty then go fill back up till the pump cuts off. This tells you the amount of fuel in LTRs you have used and the Trip shows you how many miles you have done to those Ltrs. Convert Ltrs to gallons using an online conversion and work out your true average MPG figure to a tank.
I would be supprised if you get much more than 60mpg average unless your driving like miss daisy on a clear motorway for the entire full tank of fuel.