I get between 14 and 16 L/100kms, I find it to be a legit question in figuring out if it really is affordable. Not all of us are comfortable with paying past a certain amount for fuel, and you don't have to be filthy rich to appreciate these cars.
I'm certain you would be happier spending less for fuel for the same power as would anyone else. If I could get mega power and decent fuel consumption(subjective to what you're comfortable with spending) then I'm all for it!