Is this fuel consumption normal?

[j_k_bisson]

Just asking a question about this motor fuel burn rates.

I have a 1987 225hp Evinrude outboard on a 1991 Bayliner Trophy 21' Walkaround. I have recently rebuild and repower the boat with this motor. The boat had a Force 120hp on it before. I have been running the motor since rebuild and have been logging my fuel burn/purchases. I am figiuring that I am getting 1.4 mpg since the 10 hour mark after rebuild. This rate of burn is running in small, less than 1', to moderate waves, 3'. I will admit that I have been running it at 3/4 to full throttle while I have been doing this study.

I know that boat weight, wave height, sea conditions do make a difference. Just wondering if this is in the ball park for what I can expect. I do have the pitch of the prop down a bit from what it could be with some jet tunning. But what is the max I could expect in gas milage for this motor?

The reason for this question is I basically fish offshore freshwater in the the great lakes. (Lake Erie) My destination is normally 15-25 miles offshore one way. A days fishing has gone from 20 gallons with the Force to 45-50 Gallons. More than double. I under stand I am running double the HP. But I would like some other people experence running these motors for fuel consuption rates.

 

[wilde1j]

Re: Is this fuel consumption normal?

You can expect fuel burn to be ~ 22.5gph @ WOT, less at lower power settings.

 

[clemsonfor]

Re: Is this fuel consumption normal?

my 150Gt 1990 motor on my javalin sucks fuel. I cant hardly stand it. It should be 15gallons/hr wide open well i run at like 3/4 throttle and seem to use that much fuel alone. I think my prop needs to come down some though.

 

[daselbee]

Re: Is this fuel consumption normal?

I get 2 miles per gallon, average idling and running around 3500 rpm.

 

[Scubaproh20]

Re: Is this fuel consumption normal?

My 40hp lark with my 14' rowboat gets 2.5mpg and my 14' rowboat with a 9.9 or 15 evinrude got about 3mpg unlike a car our boats are lifted up through a lot of resistance and our motors output is constant at high rpm with no overdrive all you can do is polish the bottom of that boat and get the best stainless prop money can buy. Or you could put an automotive carb,manifold and intake/exhaust on. But that's not what the coast guard or sheriff likes, something to do with boat fires

 

[w2much]

Re: Is this fuel consumption normal?

21' Striper with 1995 Evinrude 150 HP gets about 1.5 miles to the gallon average. 2 miles per gallon in flat sea going downswell. Yours is about right.