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Old 26 August 2014, 09:59   #1
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Engine drinking way too much fuel for my liking

I currently have a 135 V6 on my rib and although I knew it would drink the fuel at WOT I thought it may be more frugal at a slower speed.

Went to yarmouth from calshot last Sunday and back just at a nice steady pace of the region of 20kts and ended up using about 50 litres of fuel with 2 adults and a dog.

Boats in general are not cheap things to run but I was hoping for better consumption than I have currently.

Especially as the fuel tank on board my boat will not allow me to go much further than yarmouth without running out of fuel.

Would a smaller engine I.e 100hp or 115hp be really that much better or are all engines just absolute abysmal on consumption.

And should I just accept being skint if I want to run the boat
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Old 26 August 2014, 10:14   #2
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Something not right say you did 25 miles that's 2lt per mile you should be getting better than that, what is the engine?
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Old 26 August 2014, 10:23   #3
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I have a 150 v6 and on a good day I'll burn 1.1 ltrs per mile but if it toughs up it does go up can jump up considerably depending on throttling.


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Old 26 August 2014, 10:54   #4
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Mmmm, I did a trip round the IOW which ranged from a pootle into Cowes and Yarmouth and some WOT messing about. Ive got twin 175's on the back and did about 1.4km per ltrs.

Did you leave the anchor down
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Old 26 August 2014, 10:58   #5
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On a more serious note - wouldnt the trim affect it a lot ?
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Old 26 August 2014, 11:32   #6
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What's your hull like. If it's bad dirty that'll cos extra burn


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Old 26 August 2014, 11:43   #7
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I have a 135 Mariner V6 on my 17ft hardboat, At 5500 rpm you can watch the petrol gauge move, when cruising at 3500 it lasts slightly longer....

I love the sound and acceleration but can do the tank (50 litres) in an afternoons skiing and general bobbing about. Did a 25 mile run from Carradale to Campbeltown and back one morning with the family and emptied the tank which also made me think 2 litres a mile at WOT !!

Had a 115 on it previously but lacked the grin factor! But fuel went further.....
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Old 26 August 2014, 12:01   #8
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have the carbs been serviced and set up correctly?
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Old 26 August 2014, 12:06   #9
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i sure am glad we use gallons over here. My 7m with a 250 does about 3mpg or 1.13L/mile!! at 36mph.
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Old 26 August 2014, 12:12   #10
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Quote:
Originally Posted by paddlers View Post
I have a 135 Mariner V6 on my 17ft hardboat, At 5500 rpm you can watch the petrol gauge move, when cruising at 3500 it lasts slightly longer....

I love the sound and acceleration but can do the tank (50 litres) in an afternoons skiing and general bobbing about. Did a 25 mile run from Carradale to Campbeltown and back one morning with the family and emptied the tank which also made me think 2 litres a mile at WOT !!

Had a 115 on it previously but lacked the grin factor! But fuel went further.....

At WOT I would expect it to probably do 2 lts per mile but on Sunday we were doing mid 20's if I went WOT I reckon I'd get 50kts as she does mid 40's with a lot more to go on the throttle.
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