I have tried mixing 100 to 91 and get around 94. In my other cars ( Porsches and Ferraris) I noticed the difference. Surprisingly, on this car, I don't notice the difference when I switched it back to just 91. Even compared to when the car was running 98 in Europe, the 91 here feels the same. I am very surprised.
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2019 Range Rover Supercharged
2015 Ferrari F12
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