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Old 30 August 2011, 17:03   #1
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Hi All

As a new member and just entering the world of ribs i would be most grateful for any info on fuel consumption of petrol outboard compared to diesel inboard

Many thanks
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Old 30 August 2011, 18:39   #2
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If you search the forum you will find various previous discussions.

Broadly speaking for the same horse power you might expect a 20% saving going 2stroke --> 4 stroke and maybe another 20% going 4stroke --> diesel. But direct comparisons are not always that helpful since often the diesel is heavier, takes up more deck space (so perhaps forces you towards a bigger heavier boat etc).

At the end of the day most people report 1L/NM +/- 20% cruising in ribs regardless of fuel, engine size etc.

There are other reasons "for" diesel than ecconomy. E.g. dockside fuel availability.

Bear in mind also that "red" diesel prices should (at least technically) only be paid on fuel which is to be used for heating/cooking. The general agreement on the split that HMRC accept as "OK" on boats (60% of it for heat/cooking) may not standup with a RIB and certainly could cause problems if you've no cabin with a heater/cooker etc.
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Old 31 August 2011, 03:17   #3
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And also an outboard can generally be removed more easily if a repair requires it.

Having said that, I think the rising cost of fuel is going to drive innovation and that the long term economy of diesels is the way forward.

Boat builders like Parker have already proved that a compact boat can accommodate an inboard engine and still have plenty of deck space.
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Old 31 August 2011, 04:28   #4
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And also an outboard can generally be removed more easily if a repair requires it.
On the other hand that does make them easier to nick.
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Old 31 August 2011, 04:30   #5
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On the other hand that does make them easier to nick.
Every silver lining has a cloud
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