Fuel economy - Mercury Optimax 115

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Post Options Post Options   Likes (0) Likes(0)   Quote Steps Quote  Post ReplyReply Direct Link To This Post Posted: 02 Dec 2020 at 2:22pm
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Titanium
Titanium


Joined: 14 Oct 2013
Location: Franklin
Status: Offline
Points: 12849
All good Smudge, we have had a chat off line.

I emptied my boat out the other week and it filled half my garage

You mean the boat 1/2 filled garage ..or the junk?
Maybe its not your engine low but rather all the junk?

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Post Options Post Options   Likes (0) Likes(0)   Quote WesternBoPFisher Quote  Post ReplyReply Direct Link To This Post Posted: 23 Aug 2021 at 7:56am
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Bronze
Bronze


Joined: 24 Jul 2021
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Points: 2
According to on-line stats the 115 Optimax is meant to drink 10 litres per hour at 3000rpm. This goes up to 37 litres per hour at WOT >5500 rpm. As always, these figures may be affected by boat size, optimal prop, sea state, trim, etc :)
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Post Options Post Options   Likes (1) Likes(1)   Quote Steps Quote  Post ReplyReply Direct Link To This Post Posted: 23 Aug 2021 at 11:52am
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Titanium
Titanium


Joined: 14 Oct 2013
Location: Franklin
Status: Offline
Points: 12849
these figures may be affected by boat size, optimal prop, sea state, trim, etc :)

Boat size is if a displacement hull or semi trolling a planing hull.
 For planing hull its weight, not size.
 A well powered /propped 2S 5.5m hull will do around 0.8L/mile @ 30/32mph fast cruise 3900/4000 rpms
 Thats around 24L/hr.. normal cruise close to either side 20l/hr.

Never taken data coming back thru chop, trimed down, 2800/3000 rpms 18 to 22mph... but days like that the fuel usage drops to almost run on a 'oily rag'. min or under powered will chew thru the gas working the throttle all the time.

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