The heat flow analysis of a computerized multi-cylinder four-stroke petrol engine with constant compression ratio variable speeds operating on gasohol, TBA, and IPA blends at divergent packing circumstances of the MPFI spark ignition engine. The heat flow analysis was in consideration of practical work, the HCW, the HEG, and the unacquainted losses. The outcomes express that the heat flows analysis of the MPFI SIE running on. B15IT has shown the highest raise in T2 value at 51.88-degree centigrade (92.59%) to petrol, the highest T4 value 46.77-degree centigrade which was 97.25% lower than petrol, maximum HCW value at 31.26 kW was recorded which was 63.17 % higher than the petrol, at a speed of 4500 RPM.