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Hours/tank of gas

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Gary B.
Admiral

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USA
969 Posts

Response Posted - 09/09/2005 : 03:15:23

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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stampeder
Master Marine Consultant

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1608 Posts

Response Posted - 09/09/2005 : 16:24:24

Any other opinions regarding keel up or keel down when motoring? I didn't notice any difference in centre of gravity when I cranked my keel up and I also didn't notice any difference in speed...I tend to crank the keel up and motor when, like last weekend, the wind and waves suddenly built up and a lightening storm appeared.

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Doug
Captain

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USA
457 Posts

Response Posted - 09/09/2005 : 23:39:26

Let's see- I do about 1/3 gallon an hour. Just shy of 7 knots an hour. 23 gallons on board. That means about 21 knots an gallon or a range of about 483 nautical miles. Assuming I can get that much beer in the fridge.

I love driving my C34!

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GeorgeB
1st Mate

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90 Posts

Response Posted - 09/12/2005 : 17:08:41

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Esteban
 Any estimates for a four stroke?
<hr height="1" noshade id="quote"></blockquote id="quote">

I put about 15 hours on my evinrude 9.9 four stroke, avg speed was about 5 kts all upwind. At most I used 11 gals all season.

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Gary B.
Admiral

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USA
969 Posts

Response Posted - 09/16/2005 : 03:47:24

As a "test" last Sunday, I motored about 21 statue miles UP the Columbia River from St. Helens to Portland. I have a Yamaha 9.9 high thrust. Both the knotmeter and the GPS were showing speeds that probably averaged 6.1 knots or so. Current was quite light or nearly non-existent.

Anyway the 21 mile trip took exactly 3 hours at wide open the whole way. I was FULL when I left, and the 2 gallon portable gas can just filled it up when I came in. So...wide open: 2 gallons in 3 hours, (2/3 gph) 10.5 mpg. Happy camper I am. BTW: I ran away from other C25s with 8 hp 2 strokes and a 28' Cat with diesel. I was in about 40 minutes before them. This set up is great for motoring; heavy for racing, though.....

Yes I know I wasn't being "efficient"; this was a "test".

Gary B.
s/v Encore! #685

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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.