In the historical context of emissions reduction strategies, Exhaust Gas Recirculation (EGR) has emerged as a promising technique. The present work builds upon this foundation, employing advanced experimental techniques to evaluate CI engine performance. The experiment involves test fuel blends of ethanol, i.e., E10 (10% of ethanol + 90% of Diesel), E20 (20% of ethanol + 80% of Diesel), E30 (30% of ethanol + 70% of Diesel), and pure diesel. The experiments are conducted at 1800 RPM and 700 bar injection pressure (IOP) under varying EGR rates of 10, 20, and 30%. Through rigorous experimentation, the study analyzes key engine performance metrics, including performance and emissions characteristics. The results indicate that BTE decreases as EGR ratio increases for all fuel blends, with Ethanol blends (E10, E20, and E30) showing more moderate decreases compared to Pure diesel. NOx emissions decrease with higher EGR ratios for all fuel blends, while HC and CO emissions tend to decrease. Ethanol blends consistently exhibit less HC and CO discharges related to pure diesel.