I've run a mixed Group C (10 cars) + Group 4 (20 cars) on Slovakia Ring, AI Difficulty - 97 Race Time - 25minutes, no extra lap No damage, normal fuel and tyre usage, standing start In qualification the Group C cars are unable to complete their timed lap and go to pits and the end of the timed lap. They refuel, go out, complete the out-lap and once again pit during the timed lap. During race the Group C cars pit in the last few laps of the race, considering it is just a 25minute race, they should be able to complete it without problem. I've ran two races, and it happened in both. In one race the AI have chosen the hard compound, and in the second the soft one. The Group 4 cars performed as they should, and didn't pit during the race.