Fuel-efficient engines are designed to use less fuel while providing the same level of performance as traditional engines. They achieve this by optimizing combustion processes, reducing friction, and improving aerodynamics. This efficiency not only saves money for drivers but also reduces harmful emissions, making them better for the environment. Many modern vehicles, including hybrids and electric cars, utilize fuel-efficient engines to enhance their overall performance. These engines often incorporate advanced technologies such as turbocharging and direct fuel injection, which help maximize energy output while minimizing fuel consumption. As a result, they contribute to a more sustainable future in transportation.