Does anyone know GPH for a Yamaha 6ph (4stroke)? - SailNet Community

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Old 07-23-2012
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Question Does anyone know GPH for a Yamaha 6ph (4stroke)?

We are planning for a quick trip to Grand Isle (about 80 miles) from the lake, and we need a little help figuring out how much gas to bring. So, Does anyone know GPH use for a Yamaha 6hp (4stroke) 2008 model. We will be sailing/motor-sailing in my 1996 Hunter 23.5

Thanks for the help

Todd Hubbell
Thibodaux LA
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Todd Hubbell
Thibodaux, LA 70301

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Old 07-23-2012
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Re: Does anyone know GPH for a Yamaha 6ph (4stroke)?

I had the 8 hp and it burned 1 qt/hr at half throttle.
Hope this helps.
dick
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Old 07-23-2012
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Re: Does anyone know GPH for a Yamaha 6ph (4stroke)?

From Yamaha outboard site;
"Fuel Efficiency
The smaller the motor, the less fuel it consumes, true. However, one of Yamaha’s portables actually made it into the Guinness Book of World Records for the most miles traveled on one gallon of gas, going 67.27 continuous statute miles."
Portable | Yamaha Outboards

My 4 stroke 6hp Tohatsu burns about 1 pint per hour at 1/2 throttle doing about 4 knots at slack tide.
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Old 07-24-2012
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Re: Does anyone know GPH for a Yamaha 6ph (4stroke)?

Nissan Marine Outboards - Authorized Distributor Offering Boat Motor Products, Technical Information, & Dealer Locations for the U.S. & Canada."

and this might be of use.
• View topic - Making a Mercury high thrust propeller perform in reverse.
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Old 07-24-2012
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Re: Does anyone know GPH for a Yamaha 6ph (4stroke)?

based on experience only, mine being 6hp on a 24-foot 2400-pound sport boat, say around 150 minutes per gallon. Maybe a little more, that's conservative, two-thirds throttle which gives about 5 knots in flat water.

So, 6 gallons would probably work in favorable conditions to make 80 miles (nautical miles, huh?).

to be safe, and for adverse current or wind, maybe 10 gallons?


the deal with the weather Gods is, if you bring plenty of fuel, they'll reward you with nice breeze for motorsailing, or even just plain sailing. If you don't, they won't ;-)

Last edited by nolatom; 07-24-2012 at 11:04 AM.
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Old 07-24-2012
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Re: Does anyone know GPH for a Yamaha 6ph (4stroke)?

Hey Todd,
The stats I have is for a 6hp. Merc. not sure how simular they would be for a Yamaha.

@5,000 r.p.m. gph = 0.5.

Jimmy
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Old 07-24-2012
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Re: Does anyone know GPH for a Yamaha 6ph (4stroke)?

I thought my earlier post gave credible information but there might be more information that helps you plan a cruise.

Flat out you can expect 0.5 American gallons per hour or 2 liters per hour.

The fuel consumption at part throttle depends on several things including the wave and wind condition, load propeller and hull.

With a high thrust propeller and 4 knot boat speed in calm conditions, you will probably use 1 liter per hour.

With a headwind and heavy load, you will be close to flat out to do 4 knots and will use 1.5 liters per hour.

In survival conditions you will probably do less than 3 knots and plan to use the 2 liters per hour.

I have a 5hp two stroke and cruise several days at a time typically doing a 8 hour day motoring before cruising. I carry 65 liters of fuel with a 12 liter engine tank as my first tank, 3 10 liter gerry cans to top the first tank up and a 20 liter engine tank as a reserve for emergencies.

I use the smaller tanks first keeping the 20 liter tank for emergencies where I don't want or need to think about fuel consumption. My yacht motors with a tender at about 4 knots using slightly more than 1 liter per hour.

I always carry enough fuel to motor to safety if the weather permits and plan my days travels sailing between anchorages. The motoring at the start of a trip is generally to position myself for several days down wind sailing. Towards the end I will motor to a resupply place or home. Larger yachts might do more but if your prepared to motor a small yacht big distances, there is lots of fun to be had sailing between anchorages.

I see people forced to sail with 20 liters half gone and wonder what they were thinking when they cast off, they are stressed trying to pick destinations based on wind and fuel but then they miss the opportunities to change their minds because they have to take advantage of winds or end up stranded without enough fuel.

Like fuel, lots of water is handy, there is nothing worse than having to ration drinking water.
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