I have a 1994 Evinrude 9.9 Yachtwin on my 1980 H25. I realize there are many variables, however, does anyone have a ballpark estimate of the fuel efficiency of this motor? I need to prepare for a possible 60 or 70 miles of motoring before refueling and I'm wondering what kind of fuel amounts I should carry. I have a 6.5 gal. tank right now. I guessing 15 gal. but I'd be interested in some more learned opinions. Thanks, Dennis
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M
Mark
With absolute respect
could I suggest that you empty the tank and put in say 1 gallon. Head off at a middle rev range and see how far you get before she runs out. Of course take extra to get home again. Of course you will then be able to get a pretty accurate consumption rate. Most call outs down here are for people who run out of fuel.
could I suggest that you empty the tank and put in say 1 gallon. Head off at a middle rev range and see how far you get before she runs out. Of course take extra to get home again. Of course you will then be able to get a pretty accurate consumption rate. Most call outs down here are for people who run out of fuel.
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Bill
mileage
When I bought Hunter 1990 27 last April I motored up from south of Annapolis to my home port, a distance of aprox 44 miles and got 7 mpg with a 2001 Yamaha 4 stroke 8 hp out board. Bill
When I bought Hunter 1990 27 last April I motored up from south of Annapolis to my home port, a distance of aprox 44 miles and got 7 mpg with a 2001 Yamaha 4 stroke 8 hp out board. Bill
R
ross
variable
variables such as current, headwind, etc. can affect your mileage considerably. I would suggest a big reserve capacity once you figure your actual mileage.
variables such as current, headwind, etc. can affect your mileage considerably. I would suggest a big reserve capacity once you figure your actual mileage.
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Warren
OB Mileage
I used to have the same OB on a previous boat. While it was a great motor (always started easily), it was something of a gas hog. It may be that most 2-cycle OB's are just not very efficient. In any event, mine would burn about 2/3 gal of gas per hour doing about 5 kts in unchallenging conditions (wind less than 10 kts on the nose, waves less than a foot). In your case, that would mean you have about 10 hours of gas and you would cover about 50 miles per tank. So, your estimate of 15 gals of fuel needed should be right.
I used to have the same OB on a previous boat. While it was a great motor (always started easily), it was something of a gas hog. It may be that most 2-cycle OB's are just not very efficient. In any event, mine would burn about 2/3 gal of gas per hour doing about 5 kts in unchallenging conditions (wind less than 10 kts on the nose, waves less than a foot). In your case, that would mean you have about 10 hours of gas and you would cover about 50 miles per tank. So, your estimate of 15 gals of fuel needed should be right.
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Frank Ladd
10 HP two cycle
I'd guess at full power the motor will consume almost 1 gph. Unfortunately a 2 cycle will still consume .6 to .7 gph at half speed witch would still give you between 4 and 5 knots of speed in mild conditions. So 70 miles/5mpg = 14 gallons. So your first guess seems spot on for most conditions and maybe you could use even less....UNLESS.... If the wind and waves are really rough you may need all the power you can get to maintain control and make headway. In this case it would not be unheard of to make 1 mile per gallon of fuel. So it all depends on the weather. In calms you can motor and be fine. Infair wind you can sail and in foul weather with high wind and waves it is better for you to find a protected anchorage and wait it out. You can't beat mother nature in a boat, so don't try to keep to tight a schedule and plan for layover days.
I'd guess at full power the motor will consume almost 1 gph. Unfortunately a 2 cycle will still consume .6 to .7 gph at half speed witch would still give you between 4 and 5 knots of speed in mild conditions. So 70 miles/5mpg = 14 gallons. So your first guess seems spot on for most conditions and maybe you could use even less....UNLESS.... If the wind and waves are really rough you may need all the power you can get to maintain control and make headway. In this case it would not be unheard of to make 1 mile per gallon of fuel. So it all depends on the weather. In calms you can motor and be fine. Infair wind you can sail and in foul weather with high wind and waves it is better for you to find a protected anchorage and wait it out. You can't beat mother nature in a boat, so don't try to keep to tight a schedule and plan for layover days.
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Dennis Bidney
thanks
Thanks everyone for the responses - very helpful - even the Aussie that thinks I'm a dumb a--. Dennis
Thanks everyone for the responses - very helpful - even the Aussie that thinks I'm a dumb a--. Dennis
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Brian
Running out of gas is not necessary
If you want to test fuel economy it is not necessary to run out of gas. Just start with a full tank, motor for a suitable length of time and see how much fuel it takes to fill it up again. I don't normally run the engine for very long but I know I can run my Honda 7.5 4 stroke on my H26 at 2/3 throttle for a few hours and still have plenty of gas left in the 6 gallon tank. Fuel use appears to be less than 1 gallon per hour. I had a Johnson 15 2 stroke on my old Catalina 22 but only got a couple mpg tops out of that motor even though the boat was much smaller. I remember reading a post here before from a guy that used 1/2 gallon per hour motoring to the bahamas at 4-5 knots.
If you want to test fuel economy it is not necessary to run out of gas. Just start with a full tank, motor for a suitable length of time and see how much fuel it takes to fill it up again. I don't normally run the engine for very long but I know I can run my Honda 7.5 4 stroke on my H26 at 2/3 throttle for a few hours and still have plenty of gas left in the 6 gallon tank. Fuel use appears to be less than 1 gallon per hour. I had a Johnson 15 2 stroke on my old Catalina 22 but only got a couple mpg tops out of that motor even though the boat was much smaller. I remember reading a post here before from a guy that used 1/2 gallon per hour motoring to the bahamas at 4-5 knots.
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John Revenboer
Gas Milage
Plan on 5 NM to the gallon and you should be OK. You will come out close to using 14 gallons on your trip, so take 20 gallons so you have a reserve.
Plan on 5 NM to the gallon and you should be OK. You will come out close to using 14 gallons on your trip, so take 20 gallons so you have a reserve.
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