Outboard Motor Mileage
Approximate Fuel Consumption of an Outboard Motor
A number of factors influence outboard motor mileage; things like hull shape, weight and sea state. Generally speaking at Wide-Open Throttle, a gas outboard motor burns about 10-percent of its rated horsepower. So a 100-horsepower outboard motor would burn about 10-gallons per hour at Wide-Open Throttle. Naturally, at a lower rpm, less horsepower is generated and therefore less fuel is consumed.
|
Horsepower |
max RPM |
Gallons burned per Hour |
Liters burned per Hour |
|
2 (4-str) |
5,000 |
0.24 |
0.9 |
|
2.5 (2-str) |
4,500 |
0.4 |
1.4 |
|
3.5 (2-str) |
4,750 |
0.5 |
1.7 |
|
3.5 (4-str) |
5,500 |
0.4 |
1.4 |
| 4 (4-str) |
5,000 |
0.4 | 1.5 |
|
5(2-str) |
5,000 |
0.7 |
2.5 |
| 5(4-str) |
5,000 |
0.5 | 1.7 |
| 6 (4-str) |
5,500 |
0.5 | 2.0 |
|
8 (2-str) |
5,000 |
1.1 |
4.3 |
|
8 (4-str) |
5,500 |
0.85 |
3.2 |
|
9.8 (2-str) |
5,500 |
1.3 |
4.9 |
|
9.8 (4-str) |
5,500 |
1.0 |
3.8 |
|
9.9 (2-str) |
4,900 |
1.5 |
5.5 |
|
9.9 (4-str) |
5,000 |
1.1 |
4.0 |
|
15 (2-str) |
5,500 |
1.9 |
7.3 |
|
15 (4-str) |
5,500 |
1.5 |
5.5 |
|
18 (2-str) |
5,500 |
2.2 |
8.5 |
| 18 (4-str) |
5,500 |
1.5 | 5.7 |
|
25 (2-str) |
5,500 |
3.3 |
12.5 |
| 25 (4-str) |
5,500 |
2.3 | 8.7 |
|
30 (2-str) |
5,500 |
3.4 |
13.0 |
| 30 (4-str) |
5,500 |
2.6 | 9.8 |
|
40 (2 cyl) |
5,500 |
4.5 |
17.0 |
|
40 (3 cyl) |
5,350 |
4.5 |
17.0 |
|
40 (di) |
5,500 |
4.0 | 15.2 |
|
50 (3 cyl) |
5,500 |
5.2 |
21.0 |
|
50 (DI) |
5,500 |
5.0 | 19.0 |
|
60 (2-str) |
5,250 |
6.3 |
24.0 |
|
70 (2 cyl) |
5,250 |
7.7 |
29.0 |
|
70 (3 cyl) |
5,500 |
7.4 |
28.0 |
| 70 di |
5,500 |
6.4 | 24.2 |
|
90 (2-str) |
5,250 |
9.5 |
36.0 |
|
90 (di) |
5,500 |
8.5 | 32.0 |
|
115 (2-str) |
5,450 |
13.2 |
50.0 |
|
115 (di) |
5,500 |
12.0 |
45.5 |
|
140 (2-str) |
5,450 |
15.3 |
58.0 |
di = direct injected two-stroke.
2-str = conventional two=stroke