EDIT: Since I had a doubt, I tried to see if the issue was really the AI not choosing the right amount of fuel. I simulated a race with the same settings as above, but NO FUEL CONSUMPTION and nothing changed... in the race the AI is still very slow. WTCC 2017 – Portimão GP, AI level 93, tyre wear OFF, fuel consumption OFF Practice: 1:53.5 Qualifying: 1:51.7 Race – 8 laps: 1:54.0 (Again, all times are taken from the first two clean laps the AI complete — in this case, the three Volvos.) So it looks like a circuit-related bug, not something linked to fuel levels.