'72 1150 merc. Fuel consumption?

[Bwalker]

I recently purchased a 16' glastron Runabout/bowrider with this type motor on it. My question is with the amount of fuel I burned off! I know it's hard to give me advice due to so many variables. Also, I don't know what would determine good or bad fuel "mileage" would it be calculated by "miles" or by "hours" run. I had less than desirable conditions with some small Whitecaps, I logged about 25 mi. sometimes running a distance of about 6-8 mi @ 37-38 mph @ 3700-4000 rpm's. This consumed 5 1/2 gal. Wasn't much fun time for the cost!!

 

[kenmyfam]

Re: '72 1150 merc. Fuel consumption?

Were you running WOT ??? All depends on how much load, RPM, fighting the current or going with it ?? If you were at 2 third throttle and cruising then this is bad. If you were running wide open then maybe !!

 

[kenmyfam]

Re: '72 1150 merc. Fuel consumption?

Forgot to mention, my 16 ft Doral with 4 people on board a 140 hp Johnson and cruising at about 30 to 35 mph gets about 2.7 to 3.0 mpg gauged by gps and amount of fuel to refill again.
Hope this helps.

 

[Bwalker]

Re: '72 1150 merc. Fuel consumption?

Yes, it definitely helps! This is my first boat and I have no clue to somethings like this. I had a moderate load, I'd say 325 lbs 2/3 throttle @ about 38 mph and choppy water. Also, this sounds close because I calculated the distance and it came out to 23 mi. or per the 5 gal. used about 4 mpg. Thanks PS. I thought it should get about 15 mpg or at least thats what i wish it would get

 

[Solittle]

Re: '72 1150 merc. Fuel consumption?

The "general" rule of thumb is 10% of the hp in gal per hour at wide open throttle. So a 115 "should" burn 11.5 gal in an hour at WOT. Back it off a bit and you will do lots better.

I don't figgure gal. per hr. or miles per gal. I figgure $ of fuel per fun day. Using that if I burn 25 gal in a day at $3.00 per gallon - thats about $75.00. That gets me and my family + one or two extras (maybe 5-6 people) a fun day on the water. Try taking our 5-6 people to the movies and dinner at a family resturant - - $75.00 won't come close.

 

[kenmyfam]

Re: '72 1150 merc. Fuel consumption?

Yes, it definitely helps! This is my first boat and I have no clue to somethings like this. I had a moderate load, I'd say 325 lbs 2/3 throttle @ about 38 mph and choppy water. Also, this sounds close because I calculated the distance and it came out to 23 mi. or per the 5 gal. used about 4 mpg. Thanks PS. I thought it should get about 15 mpg or at least thats what i wish it would get

Seems you are about right then !!
With my boat I would have to paddle 12 miles of the 15 to get that gas mileage !!! LOL

 

[monk-monk]

Re: '72 1150 merc. Fuel consumption?

This thread was actually started by Username monk-monk. Believe it or not, I left iboats program running all day on my computor and came in posted this thead, came back to check responses and found it listed by bwalker. The reason I clarify this is for further threads regarding this. I have no idea how this occured! By-the-way kenmyfam..I got a great laugh outta that one

 

[Plainsman]

Re: '72 1150 merc. Fuel consumption?

Got it out in the water monk-monk!! Great to hear!

What size prop do you have on it?

 

[kenmyfam]

Re: '72 1150 merc. Fuel consumption?

This thread was actually started by Username monk-monk. Believe it or not, I left iboats program running all day on my computor and came in posted this thead, came back to check responses and found it listed by bwalker. The reason I clarify this is for further threads regarding this. I have no idea how this occured! By-the-way kenmyfam..I got a great laugh outta that one

Either that or install a mast and sail !!

 

[monk-monk]

Re: '72 1150 merc. Fuel consumption?

[whisper uid=72356]

Enter private whisper here

[/whisper] yes Eric I finally got it in the water!! It runs pretty good...I'm really happy w/ it. I still have tuning issues I need to work on. I have to idle it @ about 800 rpm's to put it in gear or it wants to stall out. Also, when I put it in gear and throttle-up, it seems like it could be "loaded-up" for it seems like it wants to be cleared out, and after i get cruising at steady throttle, it automatically increases rpm's w/ out any throttle movement at the helm and then the rpm's will stay steady. Over-all I love it and will continue to learn about this motor

 

[Plainsman]

Re: '72 1150 merc. Fuel consumption?

Hi Ed,

Mine idles around 800 too, I don't think that is a problem as long as your under 1000 (bad). I also have the same problem with the speed increase. I get no power until I get the throttle to about 9AM. If I leave it there, it picks up speed on its own. I get about 38 mph for WOT with a 19 in prop.

 

[phatmanmike]

Re: '72 1150 merc. Fuel consumption?

old inline mercs dont run on the "standard rule" they drink fuel like no tommorrow. either get used to it or get a different motor.

my last inline was a 1976 1150, mounted on a 16 foot center console with very small draft. our best was 1.5 mpg. usually wed get less than that.

wed go through 2 full 6 gall tanks in less than one hour, much less.

very famous for drinking fuel!

 

[phatmanmike]

Re: '72 1150 merc. Fuel consumption?

Thanks PS. I thought it should get about 15 mpg or at least thats what i wish it would get

wow, thats a good one! 15mpg in a boat? maybe a diesle, at idle, being towed, with the wind, downhill

 

[monk-monk]

Re: '72 1150 merc. Fuel consumption?

dam guys! That info makes me feel good because I'm getting some good fuel milage then. Now I realize...this motor drinks fuel...for fun...it cost .65 cents a gallon when they built it..it now costs nearly $ 3.00 a gallon and I ain't gettin' 15 MPG until Niagra Falls becomes the Main channel

 

[kenmyfam]

Re: '72 1150 merc. Fuel consumption?

dam guys! That info makes me feel good because I'm getting some good fuel milage then. Now I realize...this motor drinks fuel...for fun...it cost .65 cents a gallon when they built it..it now costs nearly $ 3.00 a gallon and I ain't gettin' 15 MPG until Niagra Falls becomes the Main channel

You also may get close to 15 mpg when you are towing it on the trailer.....that is.....depending on your tow vehicle ! LOL