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Catalina/Capri 25/250 Sailor's Forums

General Sailing Forum

Fuel Consumption

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Walt
1st Mate

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USA
37 Posts

Initially Posted - 01/02/2003 : 23:58:40

I have a 1993 Yamaha T9.9 High Thrust 4 cycle outboard. Does anyone know the fuel consumption of this motor. I looked all through the manual and at Yamaha's site to no avail. I am guessing around 1/2 to 2/3 gph at wot but really don't at all.
Thanks in advance
Walt Dudley

Edited by - on

Gary B.
Admiral

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USA
969 Posts

Response Posted - 01/03/2003 : 04:43:11

I think you're pretty close, but maybe a bit high. I seem to remember running mine wide open for 7 hours once, getting home from a race upstream 35 miles into a 3 knot current. I think she burned a bit over 1/2 gallon per hour. Cruising, I usually run about 2/3 throttle which pushes my 25 swinger way past hull speed and burns maybe a third of a gallon or so. Pretty darn fuel efficient, I'd say. Unless you get into some wild action, I'd think you wouldn't need to run wide open very often with this engine.

Gary B.

Encore! #685 SK/SR

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Ed Montague
Captain

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USA
499 Posts

Response Posted - 01/03/2003 : 15:26:24

I generally don't push the throttle as hard as Gary, but then we don't have currents to deal with. I would say that my 2001 9.9 Yamaha 4 stroke consumes less then 1/2 gph. On long trips I plan for that consumtion rate for planning on how much fuel to carry with some reserve.

Ed Montague on 'Yahoo'
1978 #765 SK, Stnd, Dinette ~_/)~

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Leon Sisson
Master Marine Consultant

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USA
1893 Posts

Response Posted - 01/03/2003 : 15:31:19

Walt,

I have about the same setup. I checked it once on a long day spent motoring my C-25 (swing keel) with dirty bottom up the ICW into a light headwind. I think it came out to about 10 SMPG (Statute Miles Per Gallon) at maybe 4 to 5 kts cruising speed. I expect that the reason Yamaha doesn't discuss it is that boat fuel milage is affected by so many large variables.

-- Leon Sisson

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Walt
1st Mate

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USA
37 Posts

Response Posted - 01/03/2003 : 15:53:09

Thank you guys very much for all of your input. The reason for me asking is that I want to join in on the Bahamas Flotilla in April for 2 weeks and am trying to figure out how much fuel I need, and how much fuel I can safely carry. I also have a 6-gallon spare.

I have a 1980 tr/sk with a built in fuel tank. I never received an owner’s manual for the vessel as of yet so I don’t know how much the tank will hold. It is located port side under the cockpit seat far forward. Looks like it may be around 8 gallons or so, but I can’t see all of it so was wondering if anyone else might know what was installed in 1980.

Thanks Again

Walt Dudley
1980 TR/SK #2153
Charleston, WV

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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts

Response Posted - 01/03/2003 : 18:38:59

"I have a 1980 tr/sk with a built in fuel tank. I never received an owner’s manual for the vessel as of yet so I don’t know how much the tank will hold. It is located port side under the cockpit seat far forward. Looks like it may be around 8 gallons or so, but I can’t see all of it so was wondering if anyone else might know what was installed in 1980.

As far as I know, C25's didn't come with a built in fuel tank, unless, maybe if you have a C25 with an inboard? My 1980 SR/FK w/outboard uses a 6 gallon portable tank.

Don Lucier, 'North Star'
C25 SR/FK
On the hard, 200ft from Lake Erie

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albert
Captain

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USA
262 Posts

Response Posted - 01/03/2003 : 18:54:45

Walt,

I'm planning on going on the Bahamas cruise in April also. I guess I'll catch you there.

BTW, I upgraded my fuel tank to a 7.5 gallon tempo unit sold at West Marine. I also carry two 5 gallon jugs that fit perfectly in the cockpit sole below the tiller for a total of 17.5 gallons of fuel.

According to a Don Casey article I read somewhere the average 2 stroke burned about 1gph while the average 4 stroke burned 0.8 gph.

I think the big difference in fuel consumption observed in this forum is due to the four stroke's being run at 1/2 to 1/3 throttle given their higher levels of torque.

I have a 2 stroke Tohatsu 18hp that I run at just less than 1/2 throttle and it burns about .8 gph with an average hull speed of 5.7knots with a fully loaded vessel. Under these same conditions I have a range of about 125 nm. For planning I use 1 gph.

Check out this link for approximate fuel consumption:
http://www.nissanmarine.com/tech_talk/gas_mileage.html

Albert Iturrey
al@comhertz.com
Abacus': http://www.comhertz.com/abacus

Edited by - albert on 01/03/2003 18:56:16

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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts

Response Posted - 01/03/2003 : 19:03:35

"I have a 2 stroke Tohatsu 18hp..." - Albert

An 18hp Tohatsu?...What do you do, pull waterskiers or moonlight as a tug operator? <img src=icon_smile_wink.gif border=0 align=middle>

Don Lucier, 'North Star'
C25 SR/FK
On the hard, 200ft from Lake Erie

Edited by - on

albert
Captain

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USA
262 Posts

Response Posted - 01/04/2003 : 00:35:18

<BLOCKQUOTE id=quote>quote:<hr height=1 noshade id=quote>
"I have a 2 stroke Tohatsu 18hp..." - Albert

An 18hp Tohatsu?...What do you do, pull waterskiers or moonlight as a tug operator? <img src=icon_smile_wink.gif border=0 align=middle>

Don Lucier, 'North Star'
C25 SR/FK
On the hard, 200ft from Lake Erie
<hr height=1 noshade id=quote></BLOCKQUOTE id=quote>

My boat came with a 15hp manual start johnson. I had an 18 hp tohatsu electric start with a 6 amp charger lying around. It doesn't weigh much more than a 10, but it has a ton of torque and it charges my batteries. I never need to run WOT. I do wish it had a long shaft<img src=icon_smile.gif border=0 align=middle>

Albert Iturrey
al@comhertz.com
Abacus': http://www.comhertz.com/abacus

Edited by - on

osmepneo
Past Commodore

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USA
1420 Posts

Response Posted - 01/04/2003 : 07:31:25

Walt,

At the risk of stating the obvious, when you fill your built in gas tank, you should have a very good idea of the tanks capacity - whether you fill it a pump at the marina, or fill it with an assortment of gas cans.

When I brought osmepneo from Huntinton LI to Nyack Ny we motor sailed most of the way. Distance was 40 miles (+/-) and we needed to beat up the Hudson River 20 miles with a long favored port tack. We used approxiametely 4 gallons in about 8 hours (ca .5 gph). Carried a full 3 gallon tank and 2 6 gallon gas cans for reserve.

Hope this helps you!

Don Peet
c25, 1665, osmepneo, sr/wk
The Great Sacandaga Lake, NY

Edited by - on

Arlyn Stewart
Master Marine Consultant

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USA
2984 Posts

Response Posted - 01/04/2003 : 10:21:17

In my experience the .5 number is good up to 5.3 knots... squeezing the last knot will cost another 50%. And, this is being careful to bring rpm's just to the point of reaching hull speed. This on a c250 with latest model Honda 8/9.9.

When cruising, I apply a 20% figure. The extra speed reduces cruising range by 20% but it gets me to a destination 20% faster.

Arlyn C-250 W/B #224
R&R N/E Texas and Great Lakes

[url="http://www.cox-internet.com/arlynstewart/"]Arlyn's C250 Mods n Cruisin Stories[/url]

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