In the ever-evolving landscape of automotive engineering, fuel efficiency remains a paramount concern for manufacturers, consumers, and environmental advocates alike. As the demand for fuel-efficient vehicles continues to rise, the role of various components in achieving this goal becomes increasingly critical. Among these components, leaf springs, a fundamental element of vehicle suspension systems, play a significant yet often overlooked role in influencing fuel efficiency. This comprehensive analysis delves into how leaf springs affect fuel efficiency, examining their design, material composition, weight, and overall impact on vehicle dynamics.