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  1. E

    Fuel octane?

    Help! A lot of back and forth. NC has 87, 89, and 93 readily available. The 2025 ST recommends 91 to achieve the full 400 HP. Best I can tell, the HP/performance difference in any of this is somewhat negligible. I can experiment but is 93 worth it... or should I just put in 87 and go with...


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