Question

what do you mean by octane rating

Answer 1

Octane rating is a measure of a fuel's ability to resist 'knock'

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Answer 2

"An octane rating , or octane number, is a standard measure of the performance of an engine or aviation fuel. The higher the octane Number , the more compression the fuel can withstand before detonating (igniting). ... Therefore, high compressibility of the fuel matters mainly for gasoline engines."