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Hours/tank of gas

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Steve Siefken
1st Mate

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USA
81 Posts

Initially Posted - 08/15/2005 : 22:59:59

Just bought my boat this spring, and I am planning for a trip that I may have to motor for several hours (darn the bad luck!

).

I have a 2 stroke 9.9 horse engine (with 2 three gallon tanks) and I was trying to estimate how many hours per tank of gas I could expect.

Also, any tips for a typical cruising speed?

Thanks,

Steve Siefken
'84 SK/SR #4654 "Nicosha"

Edited by - on

mashedcat
Navigator

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USA
194 Posts

Response Posted - 08/16/2005 : 00:02:34

just figured my usage on a three week cruise: motoring time vs. iters/gallons purchased for a 2 stroke 9 horse nissan. 1 gal per hr

Edited by - on

mashedcat
Navigator

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USA
194 Posts

Response Posted - 08/16/2005 : 00:04:54

forgot to add speed approx 5kt

Edited by - on

dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts

Response Posted - 08/16/2005 : 09:03:14

A gallon per hour is a good estimate.

When cruising, I always carry twice as much fuel as I think I'll need between fuel stops.

Edited by - on

aeckhart
Master Marine Consultant

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USA
1709 Posts

Response Posted - 08/16/2005 : 13:06:06

I realize that it's traditonal to mesure in hours of operation but it is more useful for me to measure in terms of miles per gallon. My 9.9 2-stroke Evinrude makes about 6 miles per gallon of gas in chop less than 1 foot at about 5 kts. Performance decreases as the wind and waves increase.

Since I do my long distance sailing on Lake Superior, I make sure I have plenty of gas. I carry a 12 Gallon tank in the cockpit stored against the transom, along with the six gallon tank in the fuel locker. On a god day I can make around 108 miles, or so.

Edited by - aeckhart on 08/16/2005 13:12:15

Esteban
Navigator

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139 Posts

Response Posted - 08/16/2005 : 13:38:38

Any estimates for a four stroke?

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dave holtgrave
Captain

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USA
427 Posts

Response Posted - 08/16/2005 : 13:53:02

i could roughly guess that i get about 3/4 gal per hour.
that's about a third to half throttle in fairly calm water.

dave holtgrave
5722 sk/tr

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Sloop Smitten
Master Marine Consultant

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USA
1181 Posts

Response Posted - 08/16/2005 : 13:58:57

Esteban,
I motored 115 miles at about half throttle and used 13 gallons of gas on my recent trip to Catlina using a Honda 8HP 4 Stroke. I usually average 10 mile to the gallon. Much of this trip was against the current.
Joe

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Esteban
Navigator

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139 Posts

Response Posted - 08/16/2005 : 14:13:45

Sounds like just under nine miles a gallon and roughly a gallon and a half per hour at half throtle? Sounds right Joe? I have the same motor so I'd be curious to compare notes.

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Sloop Smitten
Master Marine Consultant

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USA
1181 Posts

Response Posted - 08/16/2005 : 15:07:16

That's right. I was making 6 knots or better at half throttle. If I dropped back to 5 knots it would have made the 10 miles per gallon mark. When your covering 60 miles the difference in time between 5 knots and 6 knots is two hours. Well worth the 1.1 miles per gallon penalty.

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Leon Sisson
Master Marine Consultant

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USA
1893 Posts

Response Posted - 08/16/2005 : 15:21:50

Yamaha 10HP high thrust pushing a C-25 around 5kts, with very light wind, no current, and chop less than 1' seems to get about 10 nautical miles per gallon.

-- Leon Sisson

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Douglas
Master Marine Consultant

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1595 Posts

Response Posted - 08/16/2005 : 21:51:07

Diesel 1 pint to 1 quart per Hr 2 cyl 15 H.P. Yanmar

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matsche
Captain

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USA
280 Posts

Response Posted - 08/17/2005 : 07:44:05

Tohatsu 6hp 4 stroke, 4 hrs/gallon @ 5 knots average under mostly calm lake conditions. Or about 20 k.miles/gal.

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Jmurfy
Navigator

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USA
176 Posts

Response Posted - 08/23/2005 : 00:30:06

My yamaha 9.9 four stroke burned approx 1 gallon per hour over 90 miles going across Lake Michigan last week.

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thaind
Navigator

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Canada
145 Posts

Response Posted - 08/23/2005 : 07:46:10

I carry two six gallon tanks but on last trip found that an additional five gallon mixing/carrying tank was indespensable for topping up boat tanks, carrying to non marina fuel sources, and for the extra capacity.

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John V.
Admiral

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USA
559 Posts

Response Posted - 08/23/2005 : 18:08:38

Several years ago I installed a 16 gal built in tank. This I did in response to the requirement in the waters surrounding Isle Royal National Park that no fuel be carried in jugs on deck. I'm not sure if this reg really exists but having chased fuel jugs as they banged about the upper shrouds where they were supposed to be firmly tied on deck, (storms are remarkable for dislodging things you tie there)
I was glad to have all the fuel below.

With 16 gallons I rarely have to refuel during the summer. I think I put about 500 n miles on Nin Bimash this summer and still had nearly half a tank after seven weeks.(that means there was good wind this summer) The Honda 4 stroke 10 hp motor running at half throttle sips about 1/2 gallon per hour. If I have to cover a lot of water in light wind I'll unfurl the jib and run the motor at low RPM that saves a lot of gas. some swing keelers may retract the keel in an effort to reduce drag. I have found that a retracted keel increases drag by moving the the CG aft and causing the boat to go slower.

Edited by - on

Bruce Baker
Captain

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USA
402 Posts

Response Posted - 08/24/2005 : 09:38:40

I think a gallon an hour is probably a pretty good estimate of fuel consumption. I would add that buying an extra 6 gallon tank from West Marine is cheap insurance. It costs only about $20.

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atgep
Master Marine Consultant

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1009 Posts

Response Posted - 08/24/2005 : 14:34:05

Forget the 2nd tank. Get a Jerry can for $6 and use the other $14 to fill it up.

Tom.

Edited by - on

tmhansen
Captain

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USA
397 Posts

Response Posted - 08/28/2005 : 00:14:23

I don't have extensive data yet, but on our week long trip this summer we seemed to get about 10 nm per gallon of gas with our Evenrude 15hp 4 stroke. Conditions we mostly mild, motoring up the Napa river. We motored at just about 5 knots or less most of the time.

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ClamBeach
Master Marine Consultant

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3072 Posts

Response Posted - 08/28/2005 : 10:39:35

8 Hp Honda 4 stroke (classic model)... 18 miles, two gallons. One half trip against the tide, return with the tide.

John V wrote >"I have found that a retracted keel increases drag by moving the the CG aft and causing the boat to go slower"

Agreed. Makes the stern squat way too much.

Edited by - on

pjeffarch
Navigator

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USA
135 Posts

Response Posted - 08/28/2005 : 13:10:35

What's a 'jerry can'?

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Buzz Maring
Master Marine Consultant

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USA
1768 Posts

Response Posted - 08/28/2005 : 14:18:12

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by pjeffarch
 What's a 'jerry can'?<hr height="1" noshade id="quote"></blockquote id="quote">
Hi Paul,

"Jerry can" is a common nickname for gasoline cans ... the nickname originated in WWII.

Nowadays jerry cans are made of metal, plastic, and who-knows-what-else ... instead of just old "olive drab," you can buy them in different colors, too:

Edited by - Buzz Maring on 08/28/2005 14:19:02

Jmurfy
Navigator

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USA
176 Posts

Response Posted - 09/06/2005 : 13:21:14

My Yamaha 9.9 four stroke used about a gallon per hour to make a 95 mile crossing of Lake Michigan this summer.

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JoergK
Navigator

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USA
140 Posts

Response Posted - 09/07/2005 : 15:33:33

one more: my 9.9 4-stroke Mariner, at 3.5 knots, gets me at least 12 nm /gallon.

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pjeffarch
Navigator

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USA
135 Posts

Response Posted - 09/09/2005 : 01:14:55

thanks Buzz!

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Gary B.
Admiral

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USA
969 Posts

Response Posted - 09/09/2005 : 03:14:28

My Yamaha 9.9 4 stroke can burn around 3/4 gallon an hour wide open which pushes my boat at or above hull speed of 6.3 knots. No way I can burn a gallon an hour pushing hard, wide open, into current.....

At 5.3 knots or so per hour, I am doing what seems to be 2/3 throttle, and she burns around 1/2 gallon per hour. Great cruising speed, IMHO.

Gary B.
s/v Encore! #685 SK/SR

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