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When it comes to fuels for internal combustion engines, two terms that often come up are cetane and octane.  While both diesel and gasoline fuels are used in vehicles, understanding the differences between cetane and octane can help us better understand their respective applications.Cetane and octane are both measures of the combustion quality of a fuel. Cetane is used to evaluate the ignition delay of diesel fuel, while octane measures the resistance to knocking in gasoline.The cetane numb …