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Old 20 July 2009, 15:09   #1
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Country: Greece
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Engine gas consumption

I recently owned my fathers boat and i have a question. Is there a way to calculate the gas i need when i wanna go fishing or a small trip? Im new to all this and im looking for how much litre per hour for example the boat engine is consuming.

The boat is a 13.8 feet (4.2 meters) inflatable boat with a Johnson 40 (2000 model, BJ40PLSSM) and im running it in seawater.

Thanks in advance.
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Old 20 July 2009, 15:25   #2
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Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
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Approx 4 litres per hour per 10hp at full throttle.

Work to that and give yourself an extra 1/3 of fuel too as leeway.
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Old 20 July 2009, 15:27   #3
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Country: UK - Scotland
Boat name: imposter
Make: FunYak
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Engine: 2 stroke YAM 20 HP
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As a rough guide - each 10 HP of engine will use 3.8L (1 US Gal) per hour at WOT (wide open throttle). So your 40 HP will use about 15 L per hour at full speed. You'll use less at "cruising speed" but how much less is probably best if you measure it yourself.

Most people try to allow 1/3rd of their fuel for the trip out, 1/3rd of their fuel for the trip back and the last 1/3rd as a reserve/emergencies.

[edit Nos' types faster than me!]
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Old 20 July 2009, 18:51   #4
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Thanks for your replies, ill try it out
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