AKI = Anti Knocking Index = (RON +MON) /2
RON - MON = Sensitivity.
Because the two test methods use different test conditions, especially the intake, mixture temperatures and engine speeds, then a fuel that is sensitive to changes in operating conditions will have a larger difference between the two rating methods.
Modern fuels typically have sensitivities around 10.
The US 87 (RON+MON)/2 unleaded gasoline is recommended to have a 82+ MON, thus preventing very high sensitivity fuels.
Recent changes in European gasolines has caused concern, as high sensitivity unleaded fuels have been found that fail to meet the 85 MON requirement of the EN228 European gasoline specification.
Engine Spec:
Automotive octane ratings are determined in a special single-cylinder, four stroke engine with a variable compression ratio ( CR 4:1 to 18:1 ) known as a Cooperative Fuels Research ( CFR ) engine.
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