I remember our Golf, 15 miles of fuel left, had to drop my wife off, really heavy traffic, 10 miles, then 5, then ZERO, all of a sudden and within 4 or 5 mins, with the petrol station in sight I breathed a sigh of relief. It still had according to my figures 2 litres of fuel left. The VW system is dynamic, on my Tuscon, the figure can only go down, never up!