Depends on the exact formulation. Shell Optimax+ was 99.4 RON / 87.5 MON which averages out to 93.45.
Do they even sell the Shell 100 RON in Australia anymore? I heard they were stopping last year and that now the best you could get is 98 RON (98.3 RON / 86.9 ). Probably not much different overall.
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