Quote:
Originally Posted by bimbimbop
... Now if he tunes it at 95 RON how bad will it be if I do get a real 98 RON in the tank? Should I be worried about tuning it at a lower RON?
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Tuning for lower octane will produce less power but your engine will love you if you are buying mislabeled gas.
As per Senna-F1, running higher octane fuel than what the car is tuned for will have no effect. You waste a little money buying unneeded octane but the engine won't notice. No worries.