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

Got a 96' 150 Johnson looper on my 96' V21. Both in great condition.......motor making full compression, and less than 200 hours on it.


So question is......at best cruising rpms, figure 4,000 what's the approx. fuel burn.

Approx. is fine. I haven't taken the time to fill, run, re fill, measure.

Figure you boys know from experience.

Thanks

my merc 175 black max on a 78 V20 in moderate seas with three people onboard burns 9.5 to 10 gph.. at 25-26mph.. this is direct info from my flowscan and has been accurate

Ok so at 25mph for 6 hours.........assuming calm / flat seas............we're out of fuel at approx. 150 miles.

Allowing the 1/3rd safety reserve, that's just about 50 miles out, and 50 back maximum.

Not exactly a Canyon rig, but that's not what the V's are intended to do.

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.

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

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.

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.

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.

Think we're still talking a 150 hp outboard.