What is difference between octane number and cetane number ?

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Octane and cetane number are standard measure of performance of a fuel. Octane number is related to petrol and cetane number gives quality of diesel. Higher the octane number, better the quality of petrol, and hence the vehicle gives higher efficiency. The octane no. of iso-octane is 100, while that of n heptante is 0. Similarly, higher cetane number implies good quality diesel.