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The authors described a new approach to calculation of gasoline blending formulations taking into account the non-additivity of octane numbers and the composition of the raw materials with the use of the modeling system Compounding. Gasoline blending formulations developed for "Achinsk petroleum refinery" (Russia) meeting all environmental and technical standards. Applying the developed modeling system each refinery can choose necessary formulation of gasoline production taking into account composition and available flows. This will allow them to reduce the cost of gasoline and make the products more competitive.