What's the approx. fuel burn with 150 hp ?

[THEFERMANATOR]

The OMC 60 degree engines are known as being ZTHIRSTY, but make up for it with reliability. I would figure closer to 11-12 GPH at 4K RPM's.

[fishmagnet]

Well i guess that depends on what size tank you got! I made mine 85 usable gallons... in flat/calm i get a touch over 3mpg... i like to figure mine out at
80 gal x 2.2 = 176 mile range.. which for southern california is enough for a 20' boat for offshore stuff

[fishmagnet]

for an update.. just went out last night. 24 miles total, 9 gallons = 2.67mpg.. decent sized swells ( trim tabs down a ways) we were going against at 24.5 mph when we went North.. flattened out for ride home (less tabs), cruised at 26 mph (burning 8.5 gall/hr) .. 2 people.. lighter load.

[phatdaddy]

and old rule of thumb for carbed outboards is 10% of hp per hour & back off 20 % rpm and cut fuel comsumption 15%, so,

150 hp = 15 gph @ 5500 rpm & at 4200 rpm 12.5 gph.

i have a 94 150 merc and i avg 2.5 mpg,so if figure with a 60 gallon tank a 120 mile range. i have no fuel guage, so i set my trip log on my gps and fill up when i get close to 100 miles and usually i can tell you within 3 gallons how much it will take.

[fishmagnet]

at 4200 I am burning 8.5-10 gph.. depending on load, seas etc.

[THEFERMANATOR]

Originally Posted by fishmagnet

at 4200 I am burning 8.5-10 gph.. depending on load, seas etc.

Is that a 2.4L 175 MERC? I know my 2.5L 150 MERC XRI on a flats boat would gulp down about 13-14 GPH at 4200.

[bgreene]

Think we're still talking a 150 hp outboard.

[randlemanboater]

Originally Posted by THEFERMANATOR

Is that a 2.4L 175 MERC? I know my 2.5L 150 MERC XRI on a flats boat would gulp down about 13-14 GPH at 4200.

Hey Ferm, a friend of mine is looking at a 94 18' Nitro with a 150 XRI on it, would you think fuel burn would be the same on that rig?