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Catalina/Capri 25/250 Sailor's Forums

General Sailing Forum

Honda 9.9 fuel consumption?

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kaferhaus
1st Mate

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40 Posts

Initially Posted - 01/29/2008 : 14:19:49

I'm pushing a cat 25 (or going too). Any idea on hourly consumption?

Steven Reeves
Dauphin Island, Alabama

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Nautiduck
Master Marine Consultant

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USA
3704 Posts

Response Posted - 01/29/2008 : 14:41:36

Don't know hourly consumption but we motored 16 miles using less than half our 3 gallon tank.

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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts

Response Posted - 01/29/2008 : 15:57:35

Although a lot depends on RPM's, prop, sea conditions,...etc, a ballpark estimate might be between 1/2 to 3/4 gallons per hour. To err on the side of caution, you might want to estimate between 3/4 to 1 gallons per hour because it's better to have a tad too much fuel than not enough.

Your mileage may vary.

Edited by - dlucier on 01/29/2008 16:01:38

Sloop Smitten
Master Marine Consultant

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USA
1181 Posts

Response Posted - 01/29/2008 : 16:18:07

Rough estimate - With no current or wind, motoring at 5 knots you should be able to get about 10 mpg.

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Prospector
Master Marine Consultant

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Canada
3159 Posts

Response Posted - 01/29/2008 : 16:33:03

The nice thing about that outboard is that you have the space to store a second gas can...

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piseas
Former Treasurer

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USA
2017 Posts

Response Posted - 01/29/2008 : 16:49:16

I have a 8hp Honda and almost went 26miles(to Catalina) on 3 gal tank in less than 5 hrs. And that was almost full power.
I got a 6 gal but I cant seen to fit it in the locker like others said they did. I might need some grease.
Steve A

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JohnP
Master Marine Consultant

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1520 Posts

Response Posted - 01/29/2008 : 16:58:22

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Sloop Smitten
 Rough estimate - With no current or wind, motoring at 5 knots you should be able to get about 10 mpg.
<hr height="1" noshade id="quote"></blockquote id="quote">

And I have read on a blue water cruising log somewhere that the writer's outboard engine got about twice the mileage at half the speed. It seems to make sense.

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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts

Response Posted - 01/29/2008 : 17:01:37

I figured 2/3 GPH at 5-5.5 knots thru the water, which works out to around 8 MPG (forgetting currents)--a conservative figure. That was running my Honda 8 at 1/2 - 2/3 throttle (I don't know exactly). (You probably know that the new Honda 8 and 9.9 are the same engine, except for valve timing and therefore top RPMs.) Pushing harder than that drops your MPG because as the boat approaches hull speed, it starts to squat and draws a bigger wake. I carried 9 gallons (6+3)--good for more than a day. (Now I carry 110 for 3 mpg @ 20 knots.

)

Edited by - Dave Bristle on 01/29/2008 17:11:28

OLarryR
Master Marine Consultant

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USA
3466 Posts

Response Posted - 01/29/2008 : 18:03:49

I usually estimate motoring 5 miles in an hour and figure I will use about a gallon of gas in that time. That is what I estimate but I actually motor about 5 miles using 1/2-3/4 of a gallon of gas. It is only a 3 gallon tank, so I estimate conservatively since I do not run the tank down to the empty line.

Edited by - OLarryR on 01/29/2008 22:10:02

Nautiduck
Master Marine Consultant

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USA
3704 Posts

Response Posted - 01/29/2008 : 20:58:38

Steve, my new Tempo 6 gallon tank fits snugly in the fuel locker.

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stampeder
Master Marine Consultant

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1608 Posts

Response Posted - 01/29/2008 : 21:16:01

<blockquote id="quote">quote:<hr height="1" noshade id="quote">I got a 6 gal but I cant seen to fit it in the locker like others said they did. I might need some grease.<hr height="1" noshade id="quote"></blockquote id="quote">

Grease needs to be cleaned up and will likely leave a stain. Use a bigger hammer.

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stampeder
Master Marine Consultant

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1608 Posts

Response Posted - 01/29/2008 : 21:21:40

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Any idea on hourly consumption?<hr height="1" noshade id="quote"></blockquote id="quote">

I have a 1999 Honda 9.9. I always set out on a motoring excursion factoring for 1 gallon per hour. This leaves room for error.

What I learned (the hard way) when I was a stinkpotter: always travel on the top half of the tank. Never use your last gallon of fuel.
Welcome to the group. Do you have pictures of your boat that you can post?

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piseas
Former Treasurer

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USA
2017 Posts

Response Posted - 01/29/2008 : 22:03:21

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Nautiduck
 Steve, my new Tempo 6 gallon tank fits snugly in the fuel locker.
<hr height="1" noshade id="quote"></blockquote id="quote">
Randy, ok dumb question. Which way does the fuel line face, port or starboard? I have tried to drop it in, turn on side, at angle, etc. Just dont seem to fit.
Steve A

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