2020 Mercury Marine® FourStroke 40 3-Cylinder Held to a Higher Standard. There are plenty of good reasons these outboards rule the water. Start with no-worry reliability. More low-end torque for excellent acceleration. Increased fuel economy and outstanding overall performance. Enhanced fuel injection (EFI models) for boosted efficiency. A robust electrical system with a high-output alternator to keep batteries charged and fishing electronics humming. They have everything you need, and nothing you don't. Features may include: Engine Details Worry-free reliability with outstanding performance, including enhanced fuel injection for boosted efficiency.