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Old 31 March 2014, 06:34   #1
HughN's Avatar
Country: UK - England
Town: Littlehampton, W Sx
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Fuel consumption

Does anybody have any real-word opinion on whether the "5l per hour per 10hp of power at WOT" is reasonable?


"Can ye model it? For if ye can, ye understand it, and if ye canna, ye dinna!" - Lord kelvin
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Old 31 March 2014, 07:30   #2
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
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Engine: Merc 60 Clamshell
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Litre / nautrical mile seems a good basis for trip planning as per a few threads on here, and it certainly works for my set-up.

I get 0.83L/NM averaged over a good few hundred miles since the rebuild (leaving out the 10 hrs of running in at low RPM & high oil levels)

The hard data is at home, I'll post back later with the fuel /hr figures and the average speed to go with that 0.83L. What I can say for sure is it isn't at WOT. (4.7K-ish average cruising rpm vs 5.6K nominal max)

I also have figues for the latter days of my old Suz which is in your HP bracket which I'll dig out.

In the meantime I assume you have searched for the previous threads? - there's a lot in here on this subject.

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Old 01 April 2014, 17:03   #3
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Length: 4m +
Engine: Tohatsu 18 /30 HP
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Are you inquiring about 2 or 4 strokes fuel comsumption ? If 2 strokes fuel consumption is usually 12% of rated HP at wot on flat calm no wind waters, running at near max wot rpm stated for that engine.

4 strokes swallows much less.

Happy Boating
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