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Old 18 September 2011, 05:32   #1
lakelandterrier's Avatar
Country: UK - England
Town: Gloucester
Boat name: Lunasea
Make: Ribcraft
Length: 5m +
Engine: Suzi 140
MMSI: 232005050
Join Date: Sep 2007
Posts: 1,003
Fuel Consumption - too good?

As it was to wet to go out today I've been calculating my fuel consumption this season.

My figures give 0.73litres/NM or 1.37 NM/ litre.
This on a Suzi 4stroke 100hP mix of pootling arond at displacment 5-6kts in the river & cruising ant average of 27-27 knot, 2 adults 2 children on board, mix of sea conditions. This is better than I expected.

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Old 18 September 2011, 06:04   #2
Leapy's Avatar
Country: UK - England
Town: Sheepy Parva
Boat name: Sadly Sold
Length: no boat
Join Date: Sep 2008
Posts: 1,728
Originally Posted by lakelandterrier View Post
I've been calculating my fuel consumption this season
We have too much time on our hands

I've done the same...RC5.3 with Suzuki DF90...0.59 lpnm...River at 8 kts, Estuary/Sea at 20-25 its; 3 up

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Old 18 September 2011, 08:06   #3
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Country: Ireland
Make: Redbay Boats
Length: 9m +
Engine: 370hp
Join Date: Feb 2008
Posts: 12,149
That sounds about right and is what my Etec 90s used to return (each) on a 6.5 RIB.
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Old 18 September 2011, 08:15   #4
Country: UK - Wales
Town: N Wales Chester
Boat name: Mr Smith
Make: Humber
Length: 6m +
Join Date: Feb 2009
Posts: 4,956
Sounds right to me. Based on other threads, leisure users quoting figures, so some pootling and some cruising and personal use, a 135/150hp on a 6m gives broadly 1L per mile. A bit smaller boat and engine will give just under and less the smaller you go and vice versa.

That being for a modern 2 stroke (post about 2002) or 4 stroke.

Subject to your load/type of use and balance of engine/boat. A 75 on a 6m is going to be at WOT all the time so probably use more than a 115/135 perhaps.
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