Katerina Swanson
The fuel consumption of an outboard motor depends on various factors, including the engine's horsepower, age, and load. For example, a 115 hp outboard motor's fuel consumption can vary from 2 mpg to 3.6 mpg, depending on its load and engine type. Additionally, a 115 hp outboard motor with a four-stroke, four-cylinder engine can burn around 4-5 gallons of fuel per day. At wide-open throttle, a 115 hp outboard may consume 9.7 gallons per hour, while a 150 hp engine at 4500 rpm uses 8 gallons per hour. To determine an individual engine's fuel efficiency, a fuel consumption test can be performed.
| Characteristics | Values |
|---|---|
| Fuel consumption at Wide-Open Throttle | 8-9.7 gph |
| Fuel consumption at 4500 rpm | 8 gph |
| Fuel consumption at 6000 rpm | 9.7 gph |
| Fuel consumption at 3000 rpm | 7.3 mpg |
| Fuel consumption at 4000 rpm | 6.1 mpg |
| Fuel consumption at 5000 rpm | 5.4 mpg |
| Fuel consumption at 6000 rpm | 4.5 mpg |
| Fuel consumption at 3500-4000 rpm | 7-12 mpg |
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What You'll Learn
A 115 hp outboard uses 9.7 gph at 6000 rpm
A 115 hp outboard motor uses 9.7 gallons of fuel per hour at 6000 rpm. This is a relatively high fuel consumption rate, especially when compared to newer models with similar horsepower. For example, a 150 hp outboard motor will use less fuel (8 gph) at 4500 rpm.
There are several ways to optimise fuel efficiency when using an outboard motor. Firstly, it is important to note that an outboard motor is most efficient at 75-80% of its rated output. Therefore, revving back, even slightly, can yield significant fuel savings. Additionally, throttling back a 250-horsepower outboard motor to 75% of its rated output (4728 rpm) can result in a 50% fuel savings, burning only 12.5 gallons per hour.
Another way to optimise fuel efficiency is by adjusting the vessel's trim. Vessel trim influences the drag on the hull, which in turn affects fuel consumption. The optimal trim is typically two to five degrees bow up. Additionally, travelling in favourable conditions and adjusting the boat's trim tabs can also help improve fuel efficiency.
It is worth noting that fuel consumption can vary depending on several factors, including the size and type of the engine, the boat's weight, and the driving habits of the user. For example, a newer, fuel-injected motor will use significantly less fuel than an older carbureted model. Additionally, a 150 hp engine may provide better fuel efficiency than a 115 hp engine when running at part throttle, even at the same speed.
When choosing a boat, it is recommended to prioritise size, desired extras, and performance rather than fuel consumption, as the difference in fuel mileage between a 115 hp and a 150 hp engine may not be significant enough to justify sacrificing other important factors.
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A 150 hp outboard uses 8 gph at 4500 rpm
The fuel consumption of an outboard motor depends on a variety of factors, including the engine's make, size, and power rating, as well as the vessel's size and weight. For example, a 150 hp outboard motor at 4500 rpm consumes 8 gallons per hour, while a 115 hp outboard motor at full throttle (6000 rpm) consumes 9.7 gallons per hour.
Fuel consumption can also vary depending on the engine's efficiency and age. Newer engines tend to be more fuel-efficient than older ones, and fuel-injected motors generally use less fuel than older carbureted models. Additionally, the vessel's trim and travelling conditions can impact fuel efficiency. Adjusting the trim and maintaining an optimal trim of two to five degrees bow up can reduce drag and fuel consumption.
To determine the exact fuel consumption of a specific outboard motor, it is recommended to perform a fuel consumption test. This involves filling a portable fuel tank with a measured amount of fuel and running the outboard at wide-open throttle until the tank is empty. By recording the time it takes to burn the fuel, you can calculate fuel consumption in terms of time, speed, and distance.
It is worth noting that a 150 hp outboard motor may provide better fuel efficiency compared to a 115 hp motor. A higher horsepower engine may achieve the desired speed or performance with less effort, potentially resulting in lower fuel consumption. However, the overall fuel efficiency depends on various factors, including engine specifications, vessel characteristics, and operating conditions.
In summary, a 150 hp outboard motor consumes 8 gallons per hour at 4500 rpm, while a 115 hp outboard motor at full throttle consumes slightly more. Fuel efficiency is influenced by a range of factors, and individual fuel consumption tests can provide more precise estimates for specific engines and vessels.
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A 115 hp outboard uses 4-5 gallons a day
A 115 hp outboard engine's fuel consumption will depend on a variety of factors, including the weight of the boat, the number of cylinders, the engine's age, and the revolutions per minute (RPM).
A 115 hp outboard engine will use around 4-5 gallons of fuel per day. At 4500 RPM, a 115 hp engine will use 9.7 gallons per hour, while at 6000 RPM, the engine will use 18 gallons per hour. This is because, at lower RPM, less horsepower is generated and, consequently, less fuel is burned.
The fuel efficiency of an outboard motor can be improved by throttling back to 75-80% of its rated output, which can yield significant fuel savings. Additionally, adjusting the vessel trim and travelling in favourable conditions can also help to optimise fuel efficiency.
Compared to older carbureted models, newer fuel-injected motors will be more fuel-efficient. A 115 hp outboard engine should be sufficient for most needs and will provide better fuel economy than a 150 hp engine.
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A 115 hp outboard uses 3 mpg
The fuel efficiency of an outboard motor depends on a variety of factors, such as the weight of the boat, the number of cylinders, the horsepower, and the revolutions per minute (RPM). Vessel trim also influences drag on the hull, and therefore fuel consumption.
A 115 hp outboard motor can provide fuel efficiency of 3 miles per gallon (mpg) under certain conditions. For example, a 17.5-foot center console boat with a Johnson 115 hp outboard motor can achieve "a hair over 3 mpg" when cruising with the occasional wide-open throttle (WOT).
The fuel efficiency of a 115 hp outboard motor can vary depending on the specific model and conditions. For instance, a 2018 Mercury Pro XS 115 hp 4-stroke outboard motor can achieve a burn rate of 10.5 gallons per hour (gph) at WOT (5900 RPMs), which corresponds to 1.14 mpg. At lower RPMs, less horsepower is generated, and thus less fuel is burned.
To determine the fuel consumption of a specific 115 hp outboard motor, a fuel consumption test can be performed. This involves filling a portable fuel tank with a single, measured gallon of fuel and running the outboard motor at wide-open throttle until the tank runs dry. The time it takes to burn the fuel tells the fuel consumption in time, speed, and distance.
It is worth noting that newer motors are generally more fuel-efficient than older ones. Additionally, a fuel-injected motor will typically use less fuel than a carbureted model.
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A 115 hp outboard uses 10.5 gph at 5900 rpm
A 115 hp outboard motor uses 10.5 gallons of fuel per hour at 5900 rpm. This is a rate of 1.75 miles per gallon. This figure is based on a single user's experience with their 2018 Mercury Pro XS 150 HP 4-stroke outboard motor.
The fuel consumption of an outboard motor depends on many factors, including the size of the motor, its efficiency, and the speed at which it is run. As a rule of thumb, an outboard motor running at Wide-Open Throttle (WOT) consumes about 10% of its rated horsepower in fuel. So, a 250-horsepower outboard motor at WOT (6000 rpm) burns about 25 gallons per hour. Throttling back to 75% of the outboard's rated output (4728 rpm) consumes 12.5 gph, yielding a 50% fuel saving.
The fuel efficiency of an outboard motor can be optimized by adjusting the vessel trim and travelling in favourable conditions. Additionally, newer motors are often more fuel-efficient than older motors, and the weight of the motor can also impact fuel consumption.
The fuel consumption of midrange outboard motors (25-100 HP) is between 2.3 and 11 gph at WOT. A 115 hp outboard motor is, therefore, towards the higher end of fuel consumption within this range.
The fuel mileage of 90 hp outboards is from 5-9 mpg at 3500-4000 rpm and 3-5 mpg at full throttle. This equates to 7-10 gph at WOT and 3.2-4.5 gph at best cruise speed. A 115 hp outboard motor can, therefore, be expected to have a lower fuel mileage than a 90 hp outboard motor.
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Frequently asked questions
A 150 hp outboard uses more fuel than a 115 hp outboard when running wide open. However, at part throttle, a 150 hp outboard will use less fuel than a 115 hp outboard running wide open at the same speed.
A 115 hp outboard will use more fuel than a 100 hp outboard at full throttle.
A 115 hp outboard will use 9.7 gph at 6000 rpm. At 4000 rpm, the fuel consumption is around 6-7 mpg.
A 115 hp outboard typically burns 4-5 gallons of fuel for a full day.
Newer outboard motors are significantly more fuel-efficient than older motors. A new fuel-injected motor will use a lot less fuel than an older carbureted model.
