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Standard test methods (ASTM and others) and specifications
A standard K.I. guide table relates engine C.R. to O.N. level for this specific method. The fuel air ratio for the sample fuel and each of the primary reference fuel blends is adjusted to maximize K.I. for each fuel. The Engine Speed is set to run with 600 rpm. Alternative test methods: ISO EN 5163. Typical specifications: Gasoline: Min 91 98