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How does it affect the drivers? Specifically, in my league the team Rainbow Racing ask why the low BMI driver is doing better then the high BMI?
How much does it affect the race?
BMI is a direct replacement for weight. Every attribute in this game all play a part but it is the combination rather than any single one that is important. All of the new attributes (including Special Abilities and Favourite track have small positive impacts rather than significant ones.
That said rainbow’s driver with low BMI has 28 stamina compared to the other one which is 21. High Stamina has always been very important as it impacts driver Health which affects speed So this is a likely reason why the driver with a poor BMI has been faster.