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Old 30 June 2013, 10:45   #11
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Nice to know my Opti' is about right at 8-10 US GPH at cruising speed then
Wow..You've put me off getting a big rib.my 70ft tug doesn't use that much fuel when its working hard..I'll stick with my sib..
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Old 30 June 2013, 12:17   #12
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Wow..You've put me off getting a big rib.my 70ft tug doesn't use that much fuel when its working hard..I'll stick with my sib..
Nah, but it doesn't do 35 miles in that hour either.
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Old 30 June 2013, 12:23   #13
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Nah, but it doesn't do 35 miles in that hour either.
It'll drag 70 tons at 5mph though..lol..
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Old 30 June 2013, 16:44   #14
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I have a late 80s 60hp Merc 2S and on my Tornado 5mtr, which is very light it uses about 1,2ltr/mile at its absolute most economical ie crusing on a flat sea at 16kts.

Mine uses loads mucking about at low speeds, I am afraid these things are NOT economical but they are simple, easy to fix, cheap to service etc and in my experience reliable.

As others have said that consumption sounds about right.

Davej
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Old 30 June 2013, 17:22   #15
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yeah and there I was putting rocknroll on that 9 mtr with the 2 x 200 behind in the Mania you should have seen fuel consumption then thought it was the rev counter , only because his boat got a on \ off switch
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Old 30 June 2013, 17:23   #16
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VAC2 was using 29 litres a mile on their trip back from Spain!
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Old 02 July 2013, 14:41   #17
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You need to optimize prop to achieve near max rpm factory stated parameters for that engine while moving a light, medium, loaded boat.

4K at wot is very low rpm, engine should run at least 5.5 K or will be stressed considerably, could end ruining it too. It's like going up hill with your car heavily loaded on third gear. Check which Honda props are availabe to rise rpm to near it's top stated rpm when at wot. Your fuel consumption will definitely better.

Get factory min-max wot rpm parameters for that engine and go from there playing with less pitch.

Happy Boating
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