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05 June 2008, 16:00
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#1
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Member
Country: UK - England
Town: Highcliffe
Boat name: No Name
Make: Ocean
Length: 4m +
Engine: Johnson 50 4-Stroke
Join Date: Jul 2006
Posts: 39
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Fuel usage help
Hi,
please could you help..... i have a 1990 or a 1998(im not sure) 40hp Mariner electric start and trim engine. The fuel usage is completely apauling like £28 in 5hrs of going 4 knots!!! THIS CANT BE RIGHT!!! Please can someone advise on what they think about sorting it out so its more economic!!
Thanks,
Alex
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05 June 2008, 16:22
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#2
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Member
Country: UK - England
Town: Bucks
Boat name: My Buoy & Ding Dong
Make: Ribeye,SR4 & Bombard
Length: 6m +
Engine: 115,50 & 15Hp Yams
Join Date: Feb 2004
Posts: 2,080
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I work that out to be 1.25Lt per mile so not that bad, how big is the boat?
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05 June 2008, 17:22
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#3
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Member
Country: Other
Town: San Carlos, Mexico
Boat name: INDE
Make: LOMAC 730
Length: 7m +
Engine: 200 Merc.
MMSI: Please press 1
Join Date: May 2006
Posts: 1,667
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Quote:
Originally Posted by ali_seton
Hi,
please could you help..... i have a 1990 or a 1998(im not sure) 40hp Mariner electric start and trim engine. The fuel usage is completely apauling like £28 in 5hrs of going 4 knots!!! THIS CANT BE RIGHT!!! Please can someone advise on what they think about sorting it out so its more economic!!
Thanks,
Alex
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Sounds about right to me. You should not assume that going slow is more economical. It is not as you are just pushing water. A planing hull is at it's most efficient on the plane at about 3500-4000 RPM.
__________________
Running around like a head with it's chicken cut off.
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05 June 2008, 18:50
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#4
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RIBnet admin team
Country: UK - England
Town: Swindon
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 239050687/235055163
Join Date: Jul 2005
Posts: 8,881
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Yep. sounds about right to me too.
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05 June 2008, 19:19
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#5
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Member
Country: UK - England
Town: Highcliffe
Boat name: No Name
Make: Ocean
Length: 4m +
Engine: Johnson 50 4-Stroke
Join Date: Jul 2006
Posts: 39
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it cant be right as when i am going at speed the boat does about £10 per 30 minutes! its a 4m rib
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05 June 2008, 19:47
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#6
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Member
Country: Other
Town: San Carlos, Mexico
Boat name: INDE
Make: LOMAC 730
Length: 7m +
Engine: 200 Merc.
MMSI: Please press 1
Join Date: May 2006
Posts: 1,667
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Quote:
Originally Posted by ali_seton
it cant be right as when i am going at speed the boat does about £10 per 30 minutes! its a 4m rib
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Yes, but you travel X times the distance. Fuel consumption is primarily distance related not time. Get your calculator out. 
__________________
Running around like a head with it's chicken cut off.
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05 June 2008, 20:31
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#7
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Member
Country: UK - England
Town: Highcliffe
Boat name: No Name
Make: Ocean
Length: 4m +
Engine: Johnson 50 4-Stroke
Join Date: Jul 2006
Posts: 39
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ok..... is there anything i can do to lower fuel usage????
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05 June 2008, 20:36
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#8
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Member
Country: Other
Town: San Carlos, Mexico
Boat name: INDE
Make: LOMAC 730
Length: 7m +
Engine: 200 Merc.
MMSI: Please press 1
Join Date: May 2006
Posts: 1,667
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Quote:
Originally Posted by ali_seton
ok..... is there anything i can do to lower fuel usage????
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Buy some oars 
__________________
Running around like a head with it's chicken cut off.
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05 June 2008, 21:05
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#9
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Member
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,788
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My RIB does about 5mpg on tickover which is about 5mph. That is near enough 1L per mile - not so bad for a 225hp so maybe his is a little thirsty - my boat isn't exactly small either!!!
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05 June 2008, 21:21
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#10
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Member
Country: UK - England
Town: Highcliffe
Boat name: No Name
Make: Ocean
Length: 4m +
Engine: Johnson 50 4-Stroke
Join Date: Jul 2006
Posts: 39
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no im being serious is there anything i can do to make it more fuel efficient..... my mates gt a 5.2 avon searider with a 70 autolube yamaha and it uses like half the fuel mine does!! please is there anything i can do???????
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