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Old 01 November 2012, 05:21   #11
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Country: Other
Town: Stanley, Falkland Is
Boat name: Seawolf
Make: Osprey Vipermax 5.8
Length: 5m +
Engine: Etec 150
Join Date: Mar 2006
Posts: 3,688
My 150 E-TEC on a 5.8m usually achieves somewhere about 1.15nm/L (about 1.3 miles/litre) in the cruise which I think is sitting about 3500rpm ish - 26/27 knots is about the sweet spot in economy and I focus more on speed than rpm. So I'd expect a 60 to be much better than that.
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Old 01 November 2012, 08:45   #12
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Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
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1.15 nm/L = 0.86l/nm - Not much worse than mine..... Which is in agreement with the general consensus of loads of prevous threads that it doesn't matter what you got, 1L/nm is a good planning figure!

To put my consumption figures into perspective, since the rebuild and not including my last run, which I have not refilled since so don't have a decent number for fuel-

27 Hours, 229.5nm, 202.5 L at an overall ave speed of 11.54 knts

Of which
10 hrs were at 25:1 at slow speed (running in)
7.5 hrs were at 1500 RPM along a canal (at a spectacular 4 knots - 2L/nm )
20 miles of slow- ish speed during the Stirling cruise when we were accompanying a lot of displacement craft.

The overall average consumption taking those two unusual events into account drops to 1.04L/nm.

As the Stirling cruise & the running in become smaller proportions of the total, that average creeps down now every time I go out. Come back to this thread in a year and who knows?
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Old 02 November 2012, 04:35   #13
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Country: Other
Town: Stanley, Falkland Is
Boat name: Seawolf
Make: Osprey Vipermax 5.8
Length: 5m +
Engine: Etec 150
Join Date: Mar 2006
Posts: 3,688
My old engine (Johnson Faststrike V4 115, carbed 2 stroke) used to use more like 1.2L/nm despite being a smaller engine pushing a lighter boat (5.8 Destroyer). That's 40% more fuel than the E-TEC, and by eck I notice the difference now ... though handily (not) petrol prices have increased by 40% to compensate.

But you're right, anybody working on 1L a mile isn't going to be wildly surprised with most options. Quite bloody expensive, rather bloody expensive or very bloody expensive being the options available for running a boat
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