As always, these calculators are rough approximations and none of the numbers here are absolute. There are many other factors that come into play and careful tuning is truly the best way to determine your octane needs.

Air/Fuel Ratio
Combined CR: 13.006277918994

Recommended compression per octane
12:1 93 Pump
14:1 110 oct.
15:1 C116 oct.

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