If it's anythning like on my 2011 Sport when you think you should ahve run out of petrol 50 miles ago you'll probably find there's about 15 litres still in the tank. I haven't prooved that theory yet but thought I was very close to it but have only ever been able to get 35 litres into what I thought was an empty tank...
On my recent trip to Le Mans filling stations were few and far between. When I eventually found one with the gauge knocking on empty, she would only take 37 litres