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This paper deals with the influence of CO, CO₂, N₂, H₂, C₂H₆, C₃H₈ and C₄H₁₀ content in fuel on basic engine integral parameters. The focus is on the influence of biogas fuel composition on engine thermodynamic features. The paper describes the iterative regression method evaluating the influence of individual gas mass fraction and engine operation parameters on cumulative heat release curve of SI engines. The parameters for recalculation of heat release patterns depending on individual gas mass fraction in fuel and operation parameters are derived. The modeled cumulative heat release patterns are converted into burned fuel fraction pattern. The particular outputs are generalized using GT-POWER-based model results.