On three tests, and making sure everything that I am able to control stays the same (car[Acura GT3], car classes [LMP1, LMP900, GT3, & GT4], weather [Heavy Fog, Fog, Medium Cloud, Light Cloud with it synced to the race], track [Mojave Cougar Ridge], number of laps [40]) and when I would be lapping a GT4 car, the crew chief would tell me that that there is a faster car coming up behind me while the higher class cars are nowhere close or have retired, from running out of fuel since there is no pit road, and would do that each time I would pass one of the cars. I have done the trace and even saved a replay of the race if you need to see it for reference.