[Luke Bouwmeester]

Yes, I did some laps yesterday in Road America before the race and the 100%  consumption was like 4.4 liters/lap but it was not faster, with the Z4 I get around 6 liters in the actual race which is 200% or 170% fuel consumption I think, so you have to do a 2 pits with the SCG, which means you need some setup that would make it at least 1 s faster than the best time a lap to be able to even have a chance.
I wonder if the high consumption is also in reality or this is like a bug from AC.
It doesn't look realistic that 2 cars that do both around 2.08 for a lap, one has consumption almost double than the other.

3 vs 4.4 l/lap isn't exactly an unrealistic difference, I was testing out the Porsche and the Nissan around Laguna Seca and the Nissan used more than a litre more than the porsche. Considering all these cars are official content I highly doubt it's a bug.