About a year ago I put 39.0 litres in at a fill-up. I had driven past the BP garage on the A14 at Newmarket for a further 15 miles in the interests of reaching my local ASDA and saving about 9p a litre. I had certainly gone several miles past the "0" miles remaining indicator, and I think the last bar on the fuel gauge had also disappeared. I was quite relieved to get to ASDA, but it has given me comfort for the future that there is a good margin spare. Suffolk is pretty flat, which probably helped!