Fuel consumption of the outboard motor 150 hp: real figures and how to reduce costs

Power outboard motor 150 hp It is one of the most popular choices for boat owners and motorboats, from 5 to 7 meters in length, and provides the best balance between speed, load capacity and economy, but the key question before buying or operating such an engine is: How much gasoline will he eat? The answer depends on dozens of factors, from motor design to driving style.

In this article, we will discuss fuel consumption 150-horsepower outboard motors of leading brands (Mercury, Yamaha, Suzuki, Honda, EvinrudeLet’s give you a comparative table, and we will reveal it. Hidden causes of gasoline overruns (which dealers are silent about) and give practical tips on how to reduce fuel costs without losing momentum. running-mode Why at cruising speed the engine can spend 2 times less fuel than at maximum speeds.

1. Regulatory and real cost: why the numbers differ

Manufacturers of motors always indicate fuel consumption - usually in range 25-40 l/h But this data is from ideal conditions: on a test bench, with a new boat, with optimal loading and without water turbulence. 30–50%.

Reasons for the difference:

• 🌊 Hydrodynamics of the boat hull: flat-bottomed models consume 10-15% more fuel than boats with keel bottom.
• 👥 DownloadingEach additional passenger or 50 kg of cargo increases the cost of the 1-2 l/h.
• 🌀 Condition of the screw: Damaged or inappropriate blades reduce efficiency by 20-30%.
• 🛢️ Fuel quality: gasoline with lower octane number AI-92 It reduces combustion and increases the appetite of the engine.

For example, Yamaha F150 passport-spending 32 l/h at maximum speed, but in real conditions on the boat Stingray 205LR With 4 passengers and 2 points of excitement, that figure will rise to 40-45 l/hSimilarly, Mercury 150 Pro XS calmly 28 l/hBut when towing a skier or wakeboard sport, the expense will jump to 50+ l/h.

Table of fuel consumption by operating mode

Below is a comparison table for popular 150-horsepower models, averaged based on owner tests and independent reviews (e.g., from magazines). BoatTEST and Practical Boat Owner).

Motor model	Idle move (800–1000 rpm)	Cruising speed (3000–4,000 rpm)	Max, speed. (5500–6,000 rpm)	Notes
Yamaha F150	2.5–3 l/h	18-22 l/h	40-45 l/h	More economical than competitors at medium turnover
Mercury 150 Pro XS	3.5 l/h	20–25 l/h	45-50 l/h	High traction, but voracious at maximum
Suzuki DF150	2.5 l/h	16-20 l/h	38-42 l/h	Best in class on the cruise boat
Honda BF150	2.8–3.2 l/h	19-23 l/h	42-47 l/h	Stable work, but sensitive to fuel
Evinrude E-TEC 150	1.8-2.2 l/h	15-18 l/h	35-40 l/h	The most economical idling

Please note: the cost of cruise-speed (usually) 70–80% from maximum revolutions) in 2–2.5 times lowerIt's the optimal mode for long-distance crossings. Suzuki DF150 speedily 30-35 knots you'll spend 18 l/hand when it is accelerated to 45 knots - already 40 l/h.

3.7 Hidden Causes of Fuel Overconsumption

If your engine has started to eat gasoline above normal, check these factors – they often go unnoticed.

• 🔧 Contaminated fuel filter: increases the resistance in the system, causing the pump to work harder. 5–10%.
• 🌀 Wrong screw.: too much stride slows down and makes the motor work in the pull. 19" substitute 17" add +8 l/h.
• 🌡️ Overheating of the engine: the temperature sensor can lie, and the motor can work on the enriched mixture. thermostat and cooler.
• 🛠️ Wear of cylinders: 1,000+ motor-hours The compression drops and the engine starts to “eat” oil along with gasoline.
• 📉 Incorrect firmware ECU: After chip tuning or resetting, the motor can operate on an enriched mixture.
• 🚤 Boat bottoms are squashed: algae or mollusks on the body increase resistance to 15–20%.
• 💨 Wind and current: headwind force 10 m/s add +25% to the expense.

Especially insidious problem with screw. Many owners mistakenly believe that a big step (= more blades) will give you an increase in speed, but in fact the engine does not reach its optimal speed, and the flow rate increases. Mercury 150 boated Quicksilver Activ 605 screw 21" instead 19" increase the cost of 22 l/h before 28 l/h at the same speed.

How to check if the screw is suitable for your engine?

Take the tachometer readings at full gas with the boat fully loaded. 5000–5800 rpm 150 hp, the propeller is too heavy. Higher, too light. Optimal when the engine is on the engine. 90–95% from maximum speed.

4. How to calculate fuel consumption per route

To avoid being without gasoline in the middle of a reservoir, use a simple formula:

Freight flow (l) = (Cruising speed (l/h) × Travel time (h) × 1.2

Coefficient 1.2 It's a reserve for maneuvers, windy weather, and possible stops. Example: if you plan to sail for 2 hours. Yamaha F150 speedily 30 knots (expenditure) 20 l/h), take with you:

(20 l/h x 2 h) × 1.2 = 48 litres

For accurate calculation, use flight-computer (if any) or applications such as Navionics BoatingIt's a system that takes currents and winds into account. fuel-flower (for example, Faria Beede or Lowrance Fuel Flow Sensor), which shows the instantaneous flow rate.

🔹 Check the oil level in the engine

🔹 Examine the screw for damage

🔹 Fuel with +20% reserve

🔹 Check the weather (wind, waves)

🔹 Take a backup canister (5-10 l)->

5. Top 5 Ways to Reduce Fuel Consumption

Saving gasoline doesn't mean losing speed or comfort. Here are the proven methods:

1. Optimize the Boat LoadingSpread the load evenly, avoid overloading the stern. 100 kg weight-bearing 1-1.5 l/h to the expense.
2. Use the three-motor.At higher speeds. 20 knots mount the engine 1–2 holes And if you trimmer, it'll reduce the water resistance, but don't overdo it, because it's a high trime. screw-ventilation.
3. Clean the case and screwAfter each exit, wipe the screw from the algae, and once a season, polish the bottom of the boat. 10%.
4. Watch your turnarounds.Keep your range. 3000–4500 rpm - Here the motor works most efficiently. Mercury 150 That's the speed. 25-35 knots.
5. Check the pressure in the fuel line.A drop in pressure due to a clogged filter or faulty pump increases the flow rate 15–20%.

Special attention. trimIn practice, the right trim setup can save up to 5 l/hFor example, on Suzuki DF150 boated Bayliner 195 The optimal angle of lifting of the motor 3–4° (2-3 holes on the trimmer scale) and the speed will increase by 2-3 knotsand the cost will be reduced by 10–15%.

6. Comparison of two-stroke and four-stroke engines 150 hp

There is still a debate among water engines: what is more economical? two-stroke or Let's take a look at 150-horsepower engines.

Parameter	Two-stroke (e.g., Evinrude E-TEC 150)	Four-stroke (e.g., Suzuki DF150)
Expenditure at maximum	35-40 l/h	40-45 l/h
Expenditure on cruise	15-18 l/h	16-20 l/h
Motor weight	~180 kg	~220 kg
Service	Simpler but more expensive fuel (oil in gasoline)	More difficult (replacement of oil, valves), but cheaper fuel
Resource	1,500–2,000 motor-hours	2,500-3,000 motor-hours

At first glance, two-strokes seem more economical, but there are nuances:

• ⚠️ Two-stroke engines require petrol (proportion) 1:50 or 1:100) which increases the cost of 10–15%.
• ⚠️ Four-stroke engines. quietly It is more environmentally friendly, which is important for fishing or recreation in nature reserves.
• ⚠️ At low turns (trolling) four-strokes spend 1.5-2 l/hAnd the two-tacters. 2.5–3.5 l/h.

Conclusion: long-distance Fuel economy is better than a four-stroke engine, and High-speed walks and light boats -- two-stroke. Brig Falcon 580 s Evinrude E-TEC 150 You will save on fuel, but you will lose comfort due to noise and vibrations.

7. Frequent errors that increase the cost

Even experienced water-engineers sometimes make mistakes that lead to fuel overruns.

⚠️ Attention: Never use car oil for two-stroke outboard motors! It does not burn completely and forms a stain on the pistons, increasing the consumption of the engine. 20–30%Only specialized oils, type Mercury Premium Plus or Yamalube 2M.

• ⛽ Left-hand petrol fillingFuel with lower octane number AI-92 or with impurities leads to detonation and an increase in the cost of 10–15%.
• 🔄 Frequent acceleration/brakingAbrupt changes in rotations with 2000 before 5,500 rpm increase the cost 25–30% compared to the smooth running.
• 🌬️ Ignoring wind and currentSwim against the wind. 10 m/s It’s like carrying extra cargo behind the boat. 200-300 kg.
• 🛑 Long-term idlingFor example, if you're standing with the engine on. 1 hour, Yamaha F150 spend 3 l It's just gasoline.

Another common mistake. misfireThe first one. 10 motor hours no longer be allowed to 70% Otherwise, the piston rings will not be worn properly, and the engine will "eat" oil, and with it gasoline.

How to properly run a new engine 150 hp?

1. The first 2 hours are no more 3,000 rpm.

2. The next 8 hours - until 4,000 rpmAvoiding long-term work at the same speed.

3. after running, be sure to replace the oil (for four-strokes) or check the condition of the candles (for two-strokes).

FAQ: Answers to frequent questions

🔹 How much fuel does the engine use 150 hp on trolling (small stroke)?

At minimum speeds (800–1000 rpm) the expense shall be:

• Two-stroke engines: 2.5–3.5 l/h (for example, Evinrude E-TEC 150 — 1.8 l/h).
• Four-stroke engines.: 1.5–2.5 l/h (for example, Honda BF150 — 2 l/h).

For fishing on trolling, it is better to use a four-stroke engine or a special one. electric motor (for example, Minn Kota Terrova) which consumes 0.5–1 l/h It's the equivalent of gasoline.

🔹 what gasoline to use in the engine 150 hp - AI-92 or AI-95?

Most manufacturers recommend AI-92 (for example, Mercury and Suzuki) However,

• If the engine forced (for example, Mercury 150 Pro XSbetter AI-95 - it'll prevent detonation.
• In hot climates (+30°C and above AI-95 It is preferable because of the lower propensity to evaporate.
• For two-stroke engines (Evinrude, Johnson) octane number is not critical, but oil must be boat-only.

Use of use AI-98 It doesn't increase power, but it doesn't hurt.

🔹 Why did my 150 hp engine use up more fuel after the winter?

Probable reasons:

1. Poor winter conservation: Residues of gasoline in the carburetor (for older models) or fuel ramp could oxidize by clogging the nozzles.
2. Corrosion of the screw: if the screw wintered in a wet state, shells that reduce efficiency could appear on the blades.
3. Old fuel: Gasoline loses its octane number through 3–6 monthsIt's a bad burner.
4. Wear of candlesAfter winter, check the gap (should be) 0.7-0.9 mm for most engines.

Solution: Rinse the fuel system, replace candles, polish the propeller and refill fresh gasoline with a stabilizer additive (for example, Star Tron).

🔹 Can you reduce the cost by installing another screw?

Yes, but with reservations:

• If the engine slows down (for example, instead of 5800 giveaway 5200 rpm), set the screw with footsteps (for example, 17" instead 19"This will increase the speed and may reduce the cost of 5–10%.
• If the engine twist (turns for) 6000), try the screw with step-by-step (for example, 21"But it can make the acceleration worse.
• Optimal for fuel economy 3-blade propeller moderately pitched (e.g., Mercury Enertia 19").

Before replacing the screw, check its compatibility with the motor gearbox (transmission ratio).

🔹 Which 150 HP engine is the most economical in 2026?

Based on the test results BoatTEST.com and feedback from owners, leaders in efficiency:

1. Suzuki DF150 — 16 l/h at cruising speed, reliable and lightweight (208 kg).
2. Yamaha F150 — 18 l/h On the cruise, the best thrust at low speeds.
3. Honda BF150 — 19 l/hBut it's the quietest and most environmentally friendly.

Among the two-stroke motors stands out Evinrude E-TEC 150 - expense 15 l/h on cruise, but high price and complexity of service.

If priority is minimumTake it. Suzuki DF150If you need it. reliability and service — Yamaha F150.