Secretly refilled DIESEL?

Hello fans, sometimes a pleasant topic: During my last stay in Sweden I filled up my XC60 Drive 2.4. The BC showed the rest of the route 780 km. After approx. 100 km driving distance with 80-110 km/h with cruise control, the BC display wandered to this astronomical value. Unfortunately I was awakened from my dreams after the “show” in Germany and brought back to the hard ground of the facts with a normal consumption. Greetings Paulchen