I have just come back from North Wales on bank holiday Monday. Traffic was heavy but kept moving at a steady 50/55mph. I followed a HGV tractor unit most of the way, so never went over 56mph. I reset the BC and on my arrival at home I was very surprised to see 36.6 mpg I have not seen a figure like this, obviously due to slower speeds. I normally drive at approx. 60mph and in 5th gear and get approx. 23 to 28 mpg, depending on terrain.