# How Much Fuel Does an Outboard Use? [GPH Chart]

As a rule of thumb, the fuel consumption of most gas-powered outboard motors is somewhere between 0.3 and 55 gph at WOT. To be more precise, average gph figures within each class are as follows (at WOT):

• 0.5-20 HP (Portable): 0.3-2 gph
• 25-100 HP (Midrange): 2.3-11 gph
• 115-600 HP (High-Performance): 12-55 gph

Note that factors such as weight, hull design, water conditions, propeller pitch, speed, etc. may affect consumption figures.

But in most cases, the gph figures of outboards with a given engine power fall into the same ballpark, regardless of their make or which boat they are propelling.

For your convenience, we at PowerSportsGuide have compiled these figures into one post!

Contents

## How Much Fuel Does an Outboard Use?

General wisdom says that an outboard motor running at WOT uses 10% of its rated horsepower in gallons per hour (GPH). In other words, you can determine the fuel consumption of an outboard motor in WOT by dividing its horsepower by 10.

When boating at best cruise speed (typically 3500-4000 RPM) the fuel consumption drops to roughly 40-60% of the WOT fuel burn.

Examples:

• 50 HP outboard:
50/10 = 5 gph at WOT / 2-3 gph at 3500-4000 RPM
• 100 HP outboard:
100/10 = 10 GPH at WOT / 4-6 gph at 3500-4000 RPM

This formula works surprisingly well on the majority of gas-powered outboard motors, regardless of their make or engine size.

But if you want to drill into the details and compare the mpg and gph figures of outboards by class, keep reading.

## How Much Fuel Does a Portable Outboard Use?

Based on our research, the fuel consumption of portable outboard motors (2.5-20 HP) is around 0.3-2 gph at WOT.

The average fuel economy in this breed is as follows (at WOT):

• 2.5 HP: 0.3-0.35 gph
• 3.5 HP: 0.35-0.4 gph
• 5 HP: 0.4-0.5 gph
• 8 HP: 0.7-0.9 gph
• 9.9 HP: 0.9-1.1 gph
• 15 HP: 1.4-1.6 gph
• 20 HP: 1.6-2 gph

## How Much Fuel Does a Midrange Outboard Use?

The fuel consumption of midrange outboard motors (25-100 HP) is somewhere between 2.3 and 11 gph at WOT:

• 25 HP: 2.3-2.5 gph
• 30 HP: 2.5-3 gph
• 40 HP: 3.5-4 gph
• 50 HP: 4.5-5 gph
• 60 HP: 5-6 gph
• 75 HP: 6-7.5 gph
• 90 HP: 7-10 gph
• 100 HP: 9.5-11 gph

Let’s get down to the gritty-gritty and talk about these motors in detail!

### How Much Fuel Does a 25-30 HP Outboard Use?

The fuel consumption of 25-30 HP outboards can be anywhere from 2.3-3 gph at WOT and 1.1-1.5 gph at 3500-4000 RPM.

Rigged on a 14′ aluminum boat, a Honda BF30 produces the following test results:

• Trolling speed: 0.1-1.5 gph at 800-900prm
• Cruising speed: 1.4-1.5 gph at 3800-4000rpm
• WOT: 2.7-2.8 gph at WOT/5600-5700rpm

### How Much Fuel Does a 40 HP Outboard Use?

40 HP outboards enjoy 750-1000cc, inline-3 and 4 cylinder engines that burn 3.5-4 gph at full throttle and 1.5-2.5 gph at 3500-4000 RPM.

As a reference, here are some factory test results from various manufacturers:

• Bayliner M15 + Mercury F40:
3.8 gph/7.2 mpg (at WOT-27.2 mph)
1.8 gph/8.6 mpg (at 4000 RPM – 15.5 mph)
• Crestliner 160 Sprint pontoon + Mercury F40:
3.5 gph/4.5 mpg (at WOT-15.7 mph)
2.1 gph/5 mpg (at 4000 RPM – 10.6 mph)
• Grand 380 Gold Line (11’10” RIB) + Honda BF40:
3.8 gph/9.5 mpg (at WOT – 36 mph)
1.8 gph/13.9 mpg (at 4000rpm – 25 mph)
• Blue Fin Wiking 4.5 + Yamaha F40F
3.33 gph at WOT
1.45 gph at best cruise speed (30 mph)

### How Much Fuel Does a 50 HP Outboard Use?

The fuel consumption of 50 HP outboard motors is around 4.5 and 5 gph at WOT and they get around 2-2.5 gph at 3500-4000 RPM.

Factory test results:

• Crestliner 1600 Storm 16’ + Mercury F50:
4.4 gph/7.6 mpg (at WOT-33.5 mph)
2.5 gph/9.2 mpg (at 4000 RPM – 23.1 mph)
• Crestliner 1760 Retriever Jon Deluxe 16.8’ + Mercury F50:
4.3 gph/6.9 mpg (at WOT-29.8 mph)
2.4 gph/9.2 mpg (at 4000 RPM – 22 mph)
• Walker Bay Generation 400 (13’ RIB) + Honda BF50:
4.9 gph/6.2 mpg (at WOT-30.7 mph)
1.7 gph/10 mpg (at 4000rpm – 17 mph)
• Triumph 170 CC (16’10” fiberglass) + Honda BF50:
4.9 gph (at WOT-32 mph)
2.1 gph/11.5 mpg (at 4000rpm – 24.8 mph)
• Smoker Craft 160 Pro Angler (16’ alu) + Honda BF50:
4.4 gph at WOT and 1.6 gph at 4000rpm
• Polar Kraft V165 SC Kodiak (16’4” alu) + Honda BF50:
4.4 gph at WOT and 1.3 gph at 4000rpm
• Alumacraft 16 MV Tex Special (16’ alu) + Honda BF50:
4.65 gph at WOT and 1.65 gph at 4000rpm

How many miles per gallon does a 50 HP outboard get?

50 HP outboards typically get 5.5-8 mpg at WOT and 8-13 mpg at 3500-4000 RPM.

### How Much Fuel Does a 60 HP Outboard Use?

Based on our research, 60 HP outboards burn 5-6 gph at full throttle, which can be decreased to 2-3 gph at 3500-4000 RPM.

Factory test results:

• Crestliner 180 Sprint 18.25’ pontoon + Mercury F60:
4.7 gph/7.7 mpg (at WOT-20.8 mph)
2.2 gph/6.6 mpg (at 4000 RPM – 14.5 mph)
• War Eagle 761 Blackhawk (17’5”) + Honda BF60:
5.4 gph / 6.5 mpg (at WOT-6200rpm)
2 gph / 10.9 mpg (at 4000rpm)
• Walker Bay Generation 450 (14’9”) RIB + Honda BF60:
5.4 gph / 6 mpg (at WOT-6155rpm)
2.1 gph / 10 mpg (at 4000rpm)
• Starcraft Starfire 1600 SC (15’11”, alu) + Honda BF60:
5.4 gph / 7.1 mpg (at WOT-6000rpm)
2 gph / 11.8 mpg (at 4000rpm)

How many miles per gallon does a 60 HP outboard get?

You can expect the fuel mileage of 60 HP outboards to be 5-7 mpg at WOT and 7-12 mpg at 3500-4000 RPM.

### How Much Fuel Does a 70-75 HP Outboard Use?

You can expect the fuel consumption of 70-75 HP outboards to be in the ballpark of 5.5-7.5 gph at WOT and 2.7-4 gph at 4000 RPM.

Unlike their smaller siblings, these motors typically house larger-displacement, 1500-2000cc, 4-cylinder engines.

Factory test results:

• Rider Boats 192 Pro Sport (19’2”, alu) + Honda BF75
9 gph / 3.9 mpg (at WOT-6200rpm)
3.9 gph / 5.4 mpg (at 4000rpm)
• Polar Kraft V 186 T (18’6”, alu) + Honda BF75:
7.6 gph / 5 mpg (at WOT-5600rpm)
2.9 gph / 9.1 mpg (at 4000rpm)
• Hewescraft 160 Sportsman (16’5”, alu) + Honda BF75:
7.7 gph / 4.8 mpg (at WOT-5500rpm)
4.5 gph / 5.9 mpg (at 4000rpm)
• 4.65m fishing boat + Yamaha F70
6 gph at WOT and 3.2 gph at 4500 RPM (24 mph)
• Stessco Renegade 480 + Yamaha F70
5.8 gph at WOT and 2.7 gph at 4000 RPM (21 mph)

How many miles per gallon does a 70-75 HP outboard get?

70-75 HP outboards can get anywhere from 4-5 mpg at WOT and 5.5-9 mpg at 3500-4000 RPM.

### How Much Fuel Does a 90 HP Outboard Use?

As a rule of thumb, 90 HP outboards get 7-10 gph at WOT and 3.2-4.5 gph at best cruise speed (3500-4000 RPM).

As further reference, here are some factory test results:

• Manitou Aurora LE Angler (20” pontoon) + Mercury F90:
7.9 gph/3 mpg (at WOT-23.8 mph)
4.1 gph/4.2 mpg (at 4000 RPM-17.1 mph)
• SmokerCraft 17 Excursion + Mercury F90:
8.3 gph/4.6 mpg (at WOT-38 mph)
4 gph/5.8 mpg (at 4000 RPM-23.3 mph)
• Weldcraft 173 Rebel (17’3”, alu) + Honda BF90:
9.4 gph / 4.1 mpg (at WOT-6200rpm)
3.3 gph / 7.6 mpg (at 4000rpm)
• Ugly Boats 22’ Panga + Honda BF90:
10.5 gph / 3.6 mpg (at WOT-6250rpm)
4.5 gph / 5.7 mpg (at 4000rpm)
• Smoker Craft Ultima 172 (17’2”) + Honda BF90:
9 gph / 4.6 mpg (at WOT-6100rpm)
3.6 gph / 7 mpg (at 4000rpm)
• Bar Crusher 535XS center console + Yamaha F90:
9.8 gph at WOT and 4 gph at 4300 RPM (28 mph)

How many mpg does a 90 HP outboard get?

The fuel mileage of 90 HP outboards is from 5-9 mpg at 3500-4000 RPM and 3-5 mpg at full throttle.

### How Much Fuel Does a 100 HP Outboard Use?

Depending on the size and weight of the vessel it’s rigged on, you can expect the fuel economy of a 100 HP outboard motor to be 9.5-11 gph at WOT and 3-4.7 gph at 3500-4000 RPM.

Factory test results:

• Key West 1720 Sportsman (17’2”) + Honda BF100
10 gph / 4.1 mpg (at WOT-6300rpm)
4.3 gph / 5.8 mpg (at 4000rpm)
• Inventech 18’ RIB + Honda BF100:
10.3 gph / 4 mpg (at WOT-6100rpm)
3.1 gph / 8.6 mpg (at 4000rpm)
• Highfield Deluxe 540 (17’8” RIB) + Honda BF100:
10.1 gph / 4 mpg (at WOT-6250rpm)
4.2 gph / 5.3 mpg (at 4000rpm)

How many miles per gallon does a 100 HP outboard get?

100 HP outboard motors get roughly 2.5-4.5 mpg at WOT and 4.5-9 mpg at cruising speed.

## How Much Fuel Does a High-Performance Outboard Use?

The engine power of high-performance outboards ranges from 100 HP up to 600 HP.

These large motors are not only significantly heavier than their midrange counterparts but they tend to burn much more fuel as well.

Generally speaking, the fuel usage of high-performance outboards ranges from 10 to 55 gph at WOT, which can be reduced to 3.5-23 gph at best cruising speed.

Let’s move on and talk about the different classes one by one!

### How Much Fuel Does a 115 HP Outboard Use?

115 HP outboard motors typically burn 10-12 gph at WOT and 3.5-5 gph at 3500-4000 RPM.

As an example, a Yamaha F115 rigged on a 19-footer center console cruised at 23-25 mph burning fuel at 4 gph. At WOT, the fuel consumption increases to 10-11 gph.

Other factory test results:

• Bayliner Trophy T18 Bay + Mercury F115:
10.2 gph/3.5 mpg (at WOT-35.9 mph)
3.7 gph/5.6 mpg (at 3500 RPM – 20.4 mph)
• Crestliner XFC 189 + Mercury Pro XS115:
10.1 gph/4.5 mpg (at WOT-15.3 mph)
6.1 gph/4.8 mpg (at 4000 RPM-29 mph)
• Walker Bay Generation 525 (17’2” RIB) + Honda BF115:
10.5 gph / 3.95 mpg (at WOT-5650rpm)
4.95 gph / 5.68 mpg (at 4000rpm)
• Lund Tournament Pro SE (17.6’, alu) + Honda BF115:
10.3 gph / 4.1 mpg (at WOT-6000rpm)
4.5 gph / 6.3 mpg (at 4000rpm)
• Alumacraft Trophy 175 (17’8”, alu) + Honda BF115:
10.2 gph / 4.03 mpg (at WOT-5750rpm)
5.1 gph / 4.71 mpg (at 4000rpm)
• Carolina Skiff 19LS + Suzuki DF115:
11.1 gph / 3.74 mpg (at WOT-6000rpm)
4.3 gph / 5.97 mpg (at 4000rpm)
• Alumacraft Competitor 175 Sport + Suzuki DF115BTGX
10.6 gph/3.91 mpg (at WOT-41 mph)
3.8 gph/6.92 mpg (at 4000 RPM-27.1 mph)

How many MPG does a 115 HP outboard get?

115 HP outboards typically get 2-4 mpg at full throttle and 4-8 mpg at 3500-4000 RPM.

### How Much Fuel Does a 150 HP Outboard Use?

Popular 150 HP outboard motors can burn anywhere from 12-17 gph at WOT and 4.5-7 gph at best cruising speed (3500-4000 RPM).

Factory test results:

• Crestliner 2050 Commander + Mercury F150:
14 gph/3.4 mpg (at WOT-46.9 mph)
5.5 gph/5.2 mpg (at 3500 RPM – 28.6 mph)
• FourWinns HD 180 + Mercury F150:
14.1 gph/3.3 mpg (at WOT-47 mph)
5.1 gph/4.9 mpg (at 3500 RPM-25 mph)
• Sea Ray SPX 190 OB + Mercury F150:
14 gph/3.3 mpg (at WOT-45.7 mph)
7.1 gph/4.7 mpg (at 4000RPM-33.2 mph)
• Northwest Jet (20’) + Honda BF150:
14.6 gph / 2.6 mpg (at WOT-6000rpm)
5.5 gph / 4.1 mpg (at 4000rpm)
• Mako 192 Center Console (19’4”) + Honda BF150:
15.4 gph / 2.9 mpg (at WOT-6150rpm)
6.3 gph / 4.3 mpg (at 4000rpm)
• Hewescraft Pro Vee ET 20 (22’) + Honda BF150:
14.4 gph / 3 mpg (at WOT-6000rpm)
4.6 gph / 5.9 mpg (at 4000rpm)
• Chaparral 21 H2O Sport + Yamaha F150
16.6 gph at WOT and 5.6 gph at 3500 RPM

How many mpg does a 150 HP outboard get?

Simply put, a 150 HP outboard gets 3.5-6 mpg when cruising and 2-3.5 mpg at WOT.

### How Much Fuel Does a 175 HP Mercury Outboard Use?

You can expect the fuel economy of 175 HP outboard motors to be 12-18 gph at WOT and 4-8 gph at 3500-4000 RPM.

Factory test results:

• SmokerCraft Pro Angler 182 XL + Mercury F175:
17 gph/2.9 mpg (at WOT-48.8 mph)
7.3 gph/4.3 mpg (at 4000 RPM-31.7 mph)
• Bayliner Trophy T20 CX + Mercury Pro XS 175:
13.3 gph/2.6 mpg (at WOT-34.1 mph)
5.6 gph/3.9 mpg (at 4000 RPM-22.2 mph)
• Avalon Catalina 2385 QL + Mercury Pro XS 175:
16.4 gph/2.4 mpg (at WOT-41 mph)
7.7 gph/3.5 mpg (at 4000 RPM-27.1 mph)
• Blu Wave 220 STL Super Tunnel + Suzuki DF175TL:
16.2 gph/2.68 mpg (at WOT-43.4 mph)
6.1 gph/4.67 mpg (at 4000 RPM-28.5 mph)
• C-Hawk 23 + Suzuki DF175TX:
17 gph/2.85 mpg (at WOT-48.5 mph)
6.2 gph/4.84 mpg (at 4000 RPM-30 mph)

How many mpg does a 175 HP outboard get?

175 HP outboard motors get anywhere from 3.5-5 mpg at 3500-4000 RPM and 2-3 mpg at WOT.

### How Much Fuel Does a 200 HP Outboard Use?

200 HP outboard motors typically use 16-20 gph at WOT and 6-9 gph at 3500-4000 RPM.

Factory test results:

• Sea Ray SPX 230 OB + Mercury F200:
16.7 gph/2.6 mpg (at WOT-43.2 mph)
7.2 gph/3.9 mpg (at 4000 RPM-28.4 mph)
• Lund 1875 Tyee + Mercury Pro XS 200:
18.6 gph/2.9 mpg (at WOT-53.3 mph)
8.2 gph/4.1 mpg (at 4000 RPM-33.7 mph)
• Bennington 2275 RCW pontoon + Yamaha VF200LA:
18.8 gph/2.26 mpg (at WOT-42.5 mph)
8.6 gph/2.96 mpg (at 3500 RPM – 20.1 mph)
• Dusky Sport Center 227 + Suzuki DF200ATX:
18.4 gph/2.61 mpg (at WOT-48 mph)
6.9 gph/3.39 mpg (at 3500 RPM – 23.4 mph)
• Sundance Sea Born FX22 + Suzuki DF200ATXW:
19.5 gph/2.49 mpg (at WOT-48.6 mph)
7.5 gph/3.92 mpg (at 3500 RPM – 29.4 mph)

How many mpg does a 200 HP outboard get?

200 HP outboard motors get anywhere from 3-5 mpg at 3500-4000 RPM and 2-3 mpg at WOT.

### How Much Fuel Does a 225 HP Outboard Use?

The fuel economy of 225 HP outboard motors averages between 18-22 gph at WOT and 7.5-10 gph at 3500-4000 RPM.

Factory test results:

• Quicksilver 675 Weekender + Mercury F225:
18.1 gph/2.4 mpg (at WOT-42.7 mph)
7.4 gph/3.6 mpg (at 4000 RPM-26.6 mph)
• Lund 2075 Tyee Mag + Mercury F225:
18.4 gph/2.8 mpg (at WOT-51.9 mph)
9.4 gph/3.8 mpg (at 4000 RPM-36 mph)
• Pro-Line Boats 23 Sport + DF225TX:
19.5 gph/2.31 mpg (at WOT-45.1 mph)
7.8 gph/3.63 mpg (at 4000 RPM-28.3 mph)
• Sea Pro 239 Deep V CC + DF225TX:
19.2 gph/2.23 mpg (at WOT-42.7 mph)
7.9 gph/3.18 mpg (at 4000 RPM-25.2 mph)

How many mpg does a 225 HP outboard get?

225 HP outboards get roughly 3-4 mpg at 4000 RPM and 2-3 mpg at WOT.

### How Much Fuel Does a 250 HP Outboard Use?

The fuel economy of 250 HP outboard motors falls into the ballpark of 20-25 gph at WOT and 8-12 gph at 3500-4000 RPM.

Factory test results:

• Nautic Star 227 XTS + Mercury F250:
23.4 gph/2.5 mpg (at WOT-58.5 mph)
9.1 gph/4 mpg (at 4000 RPM-36.3 mph)
• Grady White Fisherman 216 + Mercury F250:
21.2 gph/2.2 mpg (at WOT-47.5 mph)
10 gph/3.4 mpg (at 4000 RPM-34.2 mph)
• Harris Grand Mariner 250 + Mercury F250:
22.3 gph/2 mpg (at WOT-44.7 mph)
8.4 gph/2.4 mpg (at 4000 RPM-19.8 mph)
• Alumacraft Competitor 205 Sport + Suzuki DF250TX:
21.6 gph/2.45 mpg (at WOT-52.9 mph)
8.4 gph/4.2 mpg (at 4000 RPM-34.4 mph)
• Carolina Skiff Sea Chaser 26 LX + Suzuki DF250APX:
22.5 gph/2.18 mpg (at WOT-49 mph)
9.9 gph/3.33 mpg (at 4000 RPM-34.4 mph)

How many mpg does a 250 HP outboard get?

250 HP outboards get roughly 3-4 mpg at 4000 RPM and 2-2.5 mpg at WOT.

### How Much Fuel Does a 300 HP Outboard Use?

Based on our research, 300 HP outboards get roughly 22-30 gph at WOT and 9-14 gph at cruising speed.

Factory test results:

• Glastron GTD 240 + Mercury F300:
22.7 gph/2.2 mpg (at WOT-50.2 mph)
9.4 gph/3.4 mpg (at 4000 RPM-31.7 mph)
• Glastron GTD 240 + Mercury F300:
24 gph/2.1 mpg (at WOT-49.3 mph)
10.4 gph/2.9 mpg (at 4000 RPM-30.6 mph)
• Smoker Craft SLS 5 + Mercury Verado 300:
29.4 gph/1.5 mpg (at WOT-45.1 mph)
10.3 gph/2.4 mpg (at 4000 RPM – 24.3 mph)
• Hells Bay Estero DF300AP + DF300APX4W:
26.1 gph/2.18 mpg (at WOT-56.8 mph)
9.2 gph/3.72 mpg (at 4000 RPM-34.4 mph)
• Pair Customs 2400 CC + DF300AP:
27.2 gph/1.99 mpg (at WOT-54.2 mph)
8.7 gph/3.99 mpg (at 4000 RPM-34.4 mph)

How many mpg does a 300 HP outboard get?

300 HP outboards get roughly 2.5-4 mpg at 4000 RPM and 1.5-2 mpg at WOT.

### How Much Fuel Does a 400-450 HP Outboard Use?

Let’s face it, 400-450 HP outboards are rarely used in a single configuration. When they are, these motors consume roughly 35-45 gph at WOT and 9.5-17 gph while cruising.

Factory test results:

• Barletta L25UC Pontoon + Single Mercury Verado 400:
37.3 gph/1.3 mpg (at WOT-49.7 mph)
9.6 gph/2.7 mpg (at 4000 RPM-26 mph)
• Belzona 32CC + Twin Mercury Verado 400:
74 gph/0.7 mpg (at WOT-52.3 mph)
20.5 gph/1.2 mpg (at 4000 RPM-24.3 mph)
• Axopar 37 T-Top + Twin Mercury Verado 400:
73.5 gph/0.8 mpg (at WOT-59.5 mph)
21.3 gph/1.6 mpg (at 4000 RPM-34.3 mph)

How many mpg does a 400-450 HP outboard get?

Single 400 HP outboard setups get 2-3 mpg at 4000 RPM and 1-2 mpg at WOT, while a twin configuration gets 1-1.5 gph at 4000 RPM and 0.6-0.9 gph at WOT.

### How Much Fuel Does a 600 HP Outboard Use?

One of the most powerful mass-production outboard motors is the Mercury Verado 600.

Rigged as a single, this motor burns 45-55 gph at WOT and 15-23 gph at 3500-4000 RPM. When used in a twin configuration, you can expect a fuel usage of 90-100 gph at full throttle and 35-45 gph at cruising speed.

Factory test results:

• Bennington 28QXFBWAX1 + Single Mercury Verado 600:
47.8 gph/1.2 mpg (at WOT-55.6 mph)
17.6 gph/1.9 mpg (at 4000 RPM-33 mph)
• Boston Whaler 380 Outrage + Twin Mercury Verado 600:
98.7 gph/0.6 mpg (at WOT-55.6 mph)
38.1 gph/0.9 mpg (at 4000 RPM-33 mph)
• Cruiser Yachts 42 GLS + Twin Mercury Verado 600:
100.1 gph/0.5 mpg (at WOT-49.3 mph)
41.6 gph/0.7 mpg (at 4000 RPM-29.3 mph)
• Formula 380 + Twin Mercury Verado 600:
96.5 gph/0.6 mpg (at WOT-49.3 mph)
42.6 gph/0.8 mpg (at 4000 RPM-34.7 mph)

How many mpg does a 600 HP outboard get?

A single 600 HP outboard gets around 1.5-2.5 mpg at 4000 RPM and 1-1.5 mpg at WOT, while a twin configuration gets 0.7-1 gph at 4000 RPM and 0.5-0.6 gph at WOT.

## Takeaways – Outboard Fuel Consumption Chart

As a takeaway, we’ve compiled the average mpg and gph figures of outboards motors under one roof:

### Outboard MPG Chart

Disclaimer: These charts are for informational purposes only! Factors such as weight, hull design, water conditions, propeller pitch, etc. may affect the consumption figures.

Sources: