I've just worked mine out this is made of a list of the fuel amount the cost per litre and the total miles covered over the last 3 months and it works out its averaging ............25.6mpg the car has 81500 miles on the clock it's a Le man auto Quattro I think it should be better than that by far my old 1996 a6 2.6 set are which is used everyday is the same if not better than that !!!!