Characteristics of fuels utilized in SI engine

Fuels used in Spark Ignition (SI) engines, primarily gasoline and alternative fuels like ethanol and methanol, possess specific characteristics that influence engine performance, efficiency, and emissions. One of the most critical properties is the octane number, which indicates a fuel's resistance to knocking or pre-ignition. Higher octane numbers are ______ ______ _______ ______ _______ ________ ____.
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