Should be simple on R3s. Only problem is fuel, but I'm sure it can go since it's GT2 it should make it.
Even if you can only go 1:20, do 2x of 1:20, and a 1 20min stint at the end. Saves you a ton of pit time.
All about strategy.
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*BTW, I am only referring to BL1R, I don't even know the other tracks on the schedule.
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