Fuel prices are rising, and you'll notice that on the water. Fortunately, there are many ways to reduce your outboard motor's fuel consumption without sacrificing your boating enjoyment. With a few smart adjustments, you'll not only save money but also contribute to cleaner and quieter boating. In this article, you'll find the best tips for making your engine more fuel-efficient and boating more efficient.
1. Regular maintenance pays off
A well-maintained engine consumes less fuel. Replace fuel filters regularly, check spark plugs, and keep the cooling system clean. A dirty propeller or a caked-on underside creates extra drag. Therefore, apply a fresh coat of antifouling paint every season to prevent fouling. Have your engine inspected annually by a certified technician – the carburetor and injectors, in particular, determine combustion quality.
2. Choose the right propeller
The propeller is the heart of efficiency. A pitch that's too high or too low can disrupt RPM and waste fuel. Make sure the propeller is compatible with your engine's power and the type of boat you're using.
3. Sail at the ideal speed
Many skippers unknowingly sail too fast. Every engine has an RPM range where combustion is optimal – usually between 60% and 80% of maximum power. Use a tachometer to check this. Too low an RPM (too much load) results in incomplete combustion, while too high an RPM consumes unnecessary fuel. A constant cruising speed is often most efficient.
4. Reduce weight and resistance
Every kilo on board counts. Remove unnecessary luggage, full water tanks, or heavy accessories when not needed. Also, ensure the boat is properly balanced: a tilted boat creates more drag. Also, check the hull – a smooth surface glides more smoothly through the water. Periodic cleaning with boat maintenance products helps save fuel.
5. Use the correct fuel and additives
Always use good-quality fuel suitable for your engine type (E5 or E10). Add a fuel additive if necessary to optimize combustion and keep injectors clean. Don't let fuel sit for too long; old gasoline loses its octane rating and causes contamination in the system. It's best to fill the tank more frequently, in smaller quantities, especially during seasonal use.
Additional tips for efficient sailing
- Trim the engine properly: an angle that is too high or too low increases drag.
- Plan your route with favorable wind and current directions.
- Sail smoothly away from the harbor – idling wastes fuel unnecessarily.
- Use a fuel gauge app or GPS to monitor your consumption.
Frequently asked questions about fuel economy
How much fuel does an outboard motor use on average?
That depends on the power. A 20 hp engine consumes an average of 4–6 liters per hour, a 50 hp engine approximately 8–10 liters. With proper maintenance and gentle sailing, you can reduce this by up to 20%.
What is the ideal cruising speed for fuel economy?
Sail at approximately 70% of maximum RPM. This is usually the speed at which the boat maintains planing without excessive fuel consumption.
Does electric propulsion really help save fuel?
Absolutely. Electric outboard motors are completely emission-free and much more efficient than combustion engines. They're quieter, low-maintenance, and ideal for shorter cruises.