Mercury 115 hp fule useage

[jimyoung]

I have recently purchased a 1989 merc 115 hp.....
how much fuel per can I expect to use? seems to use alot

 

[tashasdaddy]

Re: Mercury 115 hp fule useage

the rule of thumb is move the decimal point of the hp to the left 1 place. gives gallons per hour used, at wide open throttle. 115hp 11.5 gallons per hour. also depends on the boat the motor is on.. if water logged and carring extra water weight, it reduces rapidly.

 

[Bob_VT]

Re: Mercury 115 hp fule useage

Once you are up on plane back the throttle off a bit adjust your trim and you will find a sweet spot for much better fuel use. WOT does burn the gas.... you just have to treat the outboard like you treat your car. Hot rod starts will always consume more fuel.

 

[redjmp]

Re: Mercury 115 hp fule useage

My '86 115 gets 2.5 km/litre ( 5.9 mpg(US))when I nurse it at 3300 rpm on a 15'er.
At WOT it drops to 1 km/litre
My '76 50 gets 3 km/litre on a similar boat. 7 mpg
Measured with a Navman 5500 gps with the fuel sensor.

 

[bmal]

Re: Mercury 115 hp fule useage

Mentioned earlier, it depends on what you have it on, and what you are doing. I have a '90 115 on a 18' runabout used for pulling/sports. 5-6 hours with four people will burn about 12 gallons. That's a lot hard throttle, and some cruising. I say if it runs smooth, don't worry about it.

 

[redjmp]

Re: Mercury 115 hp fule useage

Wow that's really good milage bmal!
If I set my 15' 1200 lb boat to 3300 ( maximun efficiency)and cruise I burn up a 6 gallon tank in about 1 hour with just me in it. Gets me about 30 miles.

 

[jimyoung]

Re: Mercury 115 hp fule useage

Thanks to all for the responses....all good info...I am pushing a 28 foot pontoon with a hard enclosure from midships to aft, lots of weight, also had 8 people on board for first trip up the lake, again, thanks to all.

 

[Texasmark]

Re: Mercury 115 hp fule useage

I had an '89 115 Tower on a 17' Ranger Fisherman (680C) which was deep V and padded. It had a 10 gallon built in tank. I never carried extra fuel and never ran out including a Sunday afternoon's water skiing.

Don't know if it was the engine or the combination but that was the most fuel efficient, sweetest running thing I ever had.

Mark