150 Oceanrunner Fuel Consumption

Crashtackle

Cadet
Joined
Nov 25, 2009
Messages
29
Hi,

Just curious if my motor is using too much fuel. It runs sweet and I have it on a 5.60 metre, 18.5" fibreglass Haines Signature. (Aussie Boat). I am converting my kill tank to a spare fuel tank and have pulled out my old tank to run new lines. What would you consider reasonable fuel economy for this boat. I usually go out approx 75 klms to fish which is 45 miles and return on about 150 litres or 33 gallons.

I dont what to lean it down and do damage to the motor but would like to know if this is excessive or should I rework the carbys. It is running great and sounds quite strong and has less than 300 hours on it. 150hp is the maximum rating for the hull so it does the job well.. It is a 1998 model motor and I do a pre-mix at 50:01.

If I bought a new motor, what is a good motor these days with good economy? I have looked at Etec but are 4 strokes good on fuel. I have heard they are, but the maintenance costs overshadow the saving in fuel.

Crash
 
Last edited:

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
28,136
Re: 150 Oceanrunner Fuel Consumption

Crash, I have been monitoring the fuel consumption on my '98 Johnny 150HPV6, on a 21' runabout. I find the MPG varies depending on load, water conditions, speed etc. I get between 2.5MPG and 1.5MPG, so I think your readings are pretty good. If it runs well, and the spark plugs have that uniform medium-lite brown to dark brown color, I think you are fine.
 

wilde1j

Vice Admiral
Joined
Apr 15, 2002
Messages
5,964
Re: 150 Oceanrunner Fuel Consumption

Your motor will burn ~ 15 gph @ WOT, less at lower power settings. Other than making sure it's rigged right, there's not much to do to improve economy. If the AV plate is buried @ WOT, you can raise motor until it's just uncovered. That is the one thing that will save the most fuel.
 

dish

Petty Officer 2nd Class
Joined
Aug 22, 2008
Messages
151
Re: 150 Oceanrunner Fuel Consumption

Mate i have a Bertram 18 with a 1997 150 ocean pro and i roughly do a round trip of 55 miles for 80 litres.Yours sounds abit high.Although i get 45 knots at wot and can sit on 22 knots cruise at 3000,3200 revs.
 

Crashtackle

Cadet
Joined
Nov 25, 2009
Messages
29
Re: 150 Oceanrunner Fuel Consumption

Thanks for the information. It must be okay. I will check the colour of the plugs to check how it is burning.

Crash.
 

dish

Petty Officer 2nd Class
Joined
Aug 22, 2008
Messages
151
Re: 150 Oceanrunner Fuel Consumption

Are you doing 45 nautical mile round trip or 90 mile round trip? 90 mile for 150 litres sounds about right.
 
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