Marine Engine Digest

 

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Outboard Motor Mileage

 

A number of factors influence outboard motor mileage, things like hull shape, weight and sea state affect mileage. So naturally it follows the fuel consumption numbers below are approximate.

 

 

Approximate Fuel Consumption

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-str)

5,000

0.4 1.5

(2-str)

5,000

0.7

2.5

(4-str)

5,000

0.5 1.7
(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

 

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