One thing to be aware of. I have a petrol cooper, my previous car was a R56 diesel cooper and both of these have a 40litre tank. I almost always drive until nearly empty. With my dooper I was faliry sure that I still had enough reserves for a good few miles before I needed to get to a station, even when the onboard comp showed zero miles of travel left. Even then I have never put more than 38.5litres into to that tank that I can remember. With my new cooper I just filled up the tank when I had 12 miles distance left - I put exactly 40 litres into it. Maybe the distance left reading is more acurate?
Texy
Texy