As a rule of thumb, the fuel consumption of Yamaha outboards averages between 0.3 and 43 gph at WOT. To be more precise, the average gph figures within each class are as follows:
- 2.5- 25 HP (Portable): 0.3-2 gph
- 30-115 HP (Midrange): 3-11 gph
- 150-450 HP (High-Performance): 15-43 gph
Note that factors such as the boat’s specs (weight, dimensions, hull design, propeller pitch), and water conditions may affect fuel consumption figures.
But in most cases, the gph of Yamaha outboards falls into the same ballpark, regardless of which boat the motor is pushing.
For your convenience, we at PowerSportsGuide have compiled these figures into one post!
How Much Fuel Does a Portable Yamaha Outboard Use?
Based on our research, the fuel consumption of portable Yamaha outboards is about 0.38-1.69 gph. The fuel economy of the different breeds in this main class is as follows (at WOT):
- 2.5 HP: 0.3 gph
- 4 HP: 0.4 gph
- 5 HP: 0.5 gph
- 6 HP: 0.6-0.7 gph
- 8 HP: 0.8-0.9 gph
- 9.9 HP: 0.9-1.0 gph
- 15 HP: 1.4-1.5 gph
- 20 HP: 1.6-1.7 gph
How Much Fuel Does a Midrange Yamaha Outboard Use?
The fuel consumption of a midrange Yamaha outboard averages between 3 and 11 gph. Some of the most popular models in this category are as follows:
- 30 HP: 2.8-3.0 gph
- 40 HP: 3.5-4.0 gph
- 50 HP: 4.5-5 gph
- 60 HP: 5-5.5 gph
- 70 HP: 5.6-6 gph
- 90 HP: 9-9.7 gph
- 115 HP: 9.7-11 gph
Let’s get down to the gritty-gritty and talk about these motors in detail!
How Much Fuel Does a 40 HP Yamaha Outboard Use?
Yamaha 30 and 40 HP outboards share the same 747cc triple engine.
The 40 HP model burns 3.5-4.5 gph at full throttle while its de-tuned sibling goes through 2.8-3.5 gph.
For example, a 14′ aluminum boat rigged with a Yamaha F40 outboard burns 3.3-3.5 gph at WOT and 1.4-1.5 gph at best cruising speed.
Yamaha’s performance bulletins also report that a Yamaha F40FA on a G3 BOATS 15 DLX burns 1.5 gph at 18.4 mph (4000 RPM) and 4.1 gph at 29.1 mph (WOT).
How Much Fuel Does a 50 HP Yamaha Outboard Use?
50 HP Yamaha outboards are the smallest 4-cylinder models in the fleet.
They are powered by a 996cc, inline-4, SOHC engine that burns about 4.5-5 gph at WOT. Cruising at 4000 RPM, the fuel usage drops to about 2.3-2.5 gph.
How Much Fuel Does a 60 HP Yamaha Outboard Use?
50 and 60 HP Yamaha outboards feature the same engine architecture, so the fuel economy of these models is quite similar.
Based on our research, the 4-stroke Yamaha F60 burns about 5-5.5 gph at full throttle, which can be decreased to 2.5-3.0 gph at best cruising speed.
How Much Fuel Does a 70 HP Yamaha Outboard Use?
You can expect the fuel consumption of a 4-stroke Yamaha F70 to be in the ballpark of 5.6-6.0 gph at WOT.
This motor is the unleashed configuration of the 50-70 HP family including the 996cc, 4-cylinder engine.
For example, this motor on a 15′ fishing boat burns about 6 gph at WOT and 3.2 gph at 24-25 mph, just under 4500 RPM.
How Much Fuel Does a 90 HP Yamaha Outboard Use?
You can expect a 90 HP Yamaha outboard to get 9-10 gph at WOT and about 4-4.6 gph at best cruising speed.
Rigged on a 15.5′ center console boat, this motor burns 9.5-10 gph at WOT and about 4 gph at a
comfortable speed of 28-30 mph.
How many MPG does a Yamaha 90 outboard get?
Yamaha 90 outboards get about 5.5-6.5 mpg at their best cruising speed depending on the features of the boat.
How Much Fuel Does a 115 HP Yamaha Outboard Use?
115 HP Yamaha outboards typically burn about 10-11 gallons of gas at WOT and about 4-5 gph at best cruising speed.
For example, a Yamaha F115XB fitted on a 19′ center console offers a cruising speed of 23-25 mph along with a fuel burn of 4 gph. At full speed, the fuel consumption jumped to 10-11 gph.
How many MPG does a Yamaha 115 outboard get?
A 115 HP Yamaha outboard gets about 3.8-4.5 mpg at full throttle and about 4.5-6.0 mpg at best cruising speed.
How Much Fuel Does a High-Performance Yamaha Outboard Use?
How Much Fuel Does a 150 HP Yamaha Outboard Use?
Yamaha’s smallest high-performance outboard, the 150 HP family, burns roughly 15.5-16.5 gph at WOT and about 5-6 gph at best cruising speed (ca. 3500-4000 RPM).
For example, a 21-footer bowrider fitted with a Yamaha F150 uses about 16-16.5 gph at WOT and 5.5 gph at best cruising speed.
How many miles per gallon does a Yamaha 150 outboard get?
Simply put, a 150 HP Yamaha outboard gets about 4.5-5.5 mpg at best cruising speed and about 2.7-3.3 mpg at WOT.
How Much Fuel Does a 175 HP Yamaha Outboard Use?
You can expect the fuel economy of 175 HP Yamaha outboards to be 16.5-17 gph at WOT and about 5.5-7 gph at best cruising speed.
These motors are considered to be mid-size models in the 150-200 HP class, powered by the 2785cc, inline-4 engine option.
How many miles per gallon does a Yamaha 175 outboard get?
175 HP Yamaha outboards get about 4.2-5.2 mpg at best cruising speed and 2.5-2.8 mpg at WOT.
How Much Fuel Does a 200 HP Yamaha Outboard Use?
As a rule of thumb, a 200 HP Yamaha outboard can burn 18-20 gph at WOT and 6-7 gph at 3000-4000 RPM.
As reported by the manufacturer, a Bennington 2275 RCW pontoon rigged with a 4-stroke Yamaha VF200LA burns 18.8 gph at WOT (42.5 mph) which translates to 2.26 mpg.
In contrast, at 3500 rpm the boat cruised at 20.1 mph at 8.6 gph and 2.96 MPG.
How many miles per gallon does a Yamaha 200 outboard get?
200 HP Yamaha outboards get about 3.8-5.0 mpg at best cruising speed and 2.1-2.8 mpg at WOT.
The available fuel range is heavily dependent on the weight and size of the boat.
How Much Fuel Does a 225 HP Yamaha Outboard Use?
You can expect the fuel consumption of a 225 HP Yamaha outboard to be 17.7-20 gph at WOT and 4.5-5 gph at 3000 RPM.
How many miles per gallon does a Yamaha 225 outboard get?
225 HP Yamaha outboards get about 3.5-5 mpg at best cruise speed and 2.0-2.5 mpg at wot.
How Much Fuel Does a 250 HP Yamaha Outboard Use?
The fuel economy of 250 HP Yamaha outboards falls into the ballpark of 23-25 gph at WOT and 6-7 gph at 3000 RPM.
As an example, a Sportsman Heritage 231 rigged with a Yamaha F250XB gets 25 gph at full throttle, which translates to 4.61 gph, Yamaha reports.
How many miles per gallon does a Yamaha 250 outboard get?
250 HP Yamaha outboards get about 2.8-3.8 mpg at best cruising speed and 1.7-2.2 mpg at WOT.
How Much Fuel Does a 300 HP Yamaha Outboard Use?
Yamaha’s 300 HP outboards burn about 22-26 gph at full throttle and 6.5-7 gph at 3000 RPM.
According to the manufacturer, a Grady-White Fisherman 257 rigged with a single Yamaha F300UCA burned 25.9 gph at 42 mph, and cruising at 28.3 mph the boat only got 11.8 gph (4000 RPM).
The mpg figures were 1.66 and 2.4 MPG, respectively.
How many miles per gallon does a Yamaha 300 outboard get?
300 HP Yamaha outboards get about 2.3-3.3 mpg at best cruising speed and 1.6-2.0 mpg at WOT.
How Much Fuel Does a 425-450 HP Yamaha Outboard Use?
You can expect the fuel consumption of a single Yamaha’s 425-450 HP “big block” outboard to be in the ballpark of 37-43 gph at WOT, and about 8-10 gph at 3000 RPM.
Since these motors are designed for big heavy boats, they are rarely rigged in a single configuration.
Instead, Yamaha big block outboards are more often used in a multiengine setup.
For example, a 40-footer RIB rigged with twin Yamaha 425 V8 XTO burns 72-74 gph at WOT and 21-23 gph at best cruising speed.
Based on our research, quadruple Yamaha 425 V8 outboards on a 40-42-footer center console offer a fuel economy of about 140-150 gph at WOT and 60-65 gph at best cruise speed.
Takeaways – Yamaha Outboard Fuel Consumption Chart
As a takeaway, we’ve compiled the average fuel consumption figures of the most popular Yamaha outboards into one chart:
| Model | Approx. GPH at WOT |
| 2.5 HP | 0.3 GPH |
| 4 HP | 0.4 GPH |
| 5 HP | 0.5 GPH |
| 6 HP | 0.6-0.7 GPH |
| 8 HP | 0.8-0.9 GPH |
| 9.9 HP | 0.9-1.0 GPH |
| 15 HP | 1.4-1.5 GPH |
| 20 HP | 1.6-1.7 GPH |
| 25 HP | 2.2-2.5 GPH |
| 30 HP | 2.8-3.5 GPH |
| 40 HP | 3.6-4.5 GPH |
| 50 HP | 4.5-5.0 GPH |
| 60 HP | 5.0-5.5 GPH |
| 70 HP | 5.6-6.0 GPH |
| 90 HP | 9.0-10.0 GPH |
| 115 HP | 10.0-11.0 GPH |
| 150 HP | 15.5-16.5 GPH |
| 175 HP | 16.5-17.0 GPH |
| 200 HP | 18-20 GPH |
| 225 HP | 18-22 GPH |
| 250 HP | 22-25 GPH |
| 300 HP | 22-28 GPH |
| 425-450 HP | 37-43 GPH |
Disclaimer: This chart is for informational purposes only! For more information, please check the factory manuals.
Sources:
yamaha-motor.com.au, yamahaoutboards.com
