Lupo 3L – almost 10L consumption!

hello. since a few days my lupo shows the maximum consumption of 9,9l in the speedometer – so below in this display in the speedometer. I never had. otherwise it never went above 6,0l – even if I kicked it. how does the crap come at once. is something defective or what does it work? I find the totally frightening… 10L consumption. more than 9,9l can not display this display. maybe who knows what the problem can be or what could be defective. as I said: I had the otherwise never in the whole year I drove the car. Greetings,