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Alternative fuels have risen in importance and play a vital part in compression ignition engines, therefore the need to reduce reliance on Diesel as a fuel, as well as its economic implications, has arisen as a top priority. Various studies have mostly focused on the usage of alternative fuel to examine if there is a reduction in fuel consumption. To investigate the performance and pollutant emissions of a four-stroke CI engine running on ethanol–Diesel blend of 0%, 5%, 10%, 15%, 20% and 25%. Bioethanol characteristics were assessed using American Society for Testing and Materials (ASTM) standards. The results of the experiments demonstrated that utilizing ethanol–diesel mixed fuels enhanced the engine's power and torque output by a small margin. The aim of the research is to examine the range of options and future prospects for introducing Ethanol-Diesel blends, as well as subsequent alternative fuels in varying percentage ratios, into existing CI engines by diagnosing various aspects such as air-fuel ratio, operating cylinder pressure, ignition timing, and compression ratio that are only related to performance parameters.