Tohatsu 20HP MFS20ES. Boasting the honor of the lightest weight outboard in its class, Tohatsu’s newly designed MFS 20HP Electronic Fuel Injection (EFI) is a great choice for a wide variety of boaters. This 20HP electronic fuel injection four stroke has exceptional torque and top end speed, with low vibration. Another added benefit of an EFI is the fuel efficiency at wide open throttle, which allows you to go up to 50% farther on less fuel.