Currently with a full fuel tank the longest run on fuel for AI and humans is around 32 mins with green flag running. If you fuel save you can maybe stretch it to 35 mins, but that's extreme fuel saving and probably losing enough in pace to not make it worth it. IRL the car ran closer to mins per for fuel stint depending on fuel savings. I personally think the fuel usage should be very similar to the LMP2 Gen 1 cars. Both cars use NA V8s. I know the Caddy uses a 5.5L to the Gibson 4.2L, but in IMSA races both LMP2s and DPis were around 40 min full fuel stints. Currently the LMP2 Gen 1 car can get close to that 40 min stint, but the Caddy isn't anywhere close. If the Caddy's fuel efficiency was closer to the LMP2 Gen 1 it would allow for more natural races to occur between the two classes. Here is an example where the #10 WTR car was able to do a couple formation laps + 40 mins almost on the dot of green flag running before pitting for the first time at Leguna Seca. If the time stamp doesn't work it's at the 45:45 moment in the race. If we look at the alkamal results from this race you can see the two Caddy DPis are able to finish this race in 3 pit stops with only 3 laps of the entire race being under caution. Stint length range from 34 mins to almost 45 min. https://imsa.results.alkamelcloud.c...ship/202011011305_Race/20_Drive Time_Race.PDF
So I did some more testing tonight at Road America and looked at some results from Road America in 2020 and 2021. Tonight no matter how much fuel savings I tried to do I was getting about 4.0L per lap of fuel usage. My best laps were around 3.9 and my worst laps around 4.1, but I could steadily hold around 4.0L per lap. Using 4.0L per lap gave me a stint length of 18 laps on a full 75L fuel tank. When I compare that to the 2020 results the #10 WTR Cadillac did around 18 lap stints under green flag conditions as well. However, the BoP that race only allowed the Cadillac 69L on a full tank. So their 18 lap stints were averaging about 3.8L per lap. Source: https://imsa.results.alkamelcloud.com/Results/20_2020/06_Road America/01_IMSA WeatherTech SportsCar Championship/202008021105_Race/19_AnalysisByLap_Race.PDF https://www.imsa.com/wp-content/upl...SC-20-16-Road-America-BoP-Tables-07242020.pdf In 2021 the AXR Whelen #31 Cadillac did 19 lap stints under green flag conditions. They had maximum fuel tank of 72L for this race. They also averaged 3.8L per lap of fuel to achieve this 19 lap stint lengths. Source: https://imsa.results.alkamelcloud.com/Results/21_2021/15_Road America/01_IMSA WeatherTech SportsCar Championship/202108081340_Race/19_AnalysisByLap_Race.PDF https://www.imsa.com/wp-content/upl...SC-21-28-Road-America-BoP-Tables-07292021.pdf I believe the sources I've shown show the Caddy DPi is using about .2L to .4L per lap too much fuel depending on driving style compared to its RL counter part at larger tracks like Road America and close to .1L to .3L per lap on smaller tracks like Road Atlanta. If the fuel usage was more on par with the LMP2 Gen 1 cars I believe it would be more accurate and also allow better racing between the two classes. I think a fuel usage per lap of 3.7-3.8 would be more realistic for the Caddy DPi at a track like Road America than the current 4.0-4.2L we currently have.
