I've just run the tank down to 1 mile remaining, to get to my favourite ASDA pumps, and the refill took 39.0 litres to the first stop. 453 miles covered, giving 53 mpg, with the trip meter showing 57. There was still one bar showing on the gauge. The miles remaining fell quite a bit faster than the actual miles covered during the last 40 miles at 60mph. I expect there was still another 20 t0 30 miles available.