Octane Index, A Feasible Performance Indicator of Motor Gasoline

Determination of the octane number of motor gasoline is a costly and time-consuming procedure that requires the use of a testing engine that may not be available in small or out-of-the-way laboratories. Correlations between the octane number of motor gasoline and its physical and chemical properties were used to derive simple and applicable equations for the calculation of an octane index using gasoline properties that are easily and routinely measured. The gasoline properties considered include its density, boiling points, characterization factor and its cyclic compounds content.