the figure changes according to 'previous' driving style. Also, the computer isn't very accurate, around town I get 33mpg from my tdci 2.0, but when filling (full to full) it is actually around 38, that's 2-5 miles journeys from cold. On a long run taking it relaxed c 60-70, it's closer to 55 mpg. At the higher end, it overestimates, and at the lower end, underestimates. Still not figured out why it takes so long to turn over every morning in the cold though, as the batterys fine!