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

fishmagnet · #1 08-06-2011, 02:25 AM

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

THEFERMANATOR · #2 08-06-2011, 08:25 PM

Quote:

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 · #3 08-06-2011, 09:16 PM

Think we're still talking a 150 hp outboard.

Cam · #4 08-09-2011, 08:44 AM

BGreene, What size wheel are you turning?

Wolf · #5 08-09-2011, 10:34 AM

There are several ways you can do this. Conditions odviously make a difference. But, everyone wants to know how far can I go on a gallon of gas. I went out of ponce inlet a few days ago with my wife and two kids. I had exactly one gallon of gas in a milk jug, unplugged the fuel line from the engine stuck into the jug and took off. I reset my Chart plotter brought it up on plane like I normally would. Trim the engine and settled in at 3500rpm. Which is about 28 mph. and watched the fuel filled milk jug empty at a alarming rate. It's interesting to see how much fuel these old two strokes burn especially when you can actually see the fuel level drop. It gave the kids an idea of how expensive it really is to go tubing :)

The results were in:
Boat: 1978 V20 Cuddy
Engine: 1987 150 Suzuki Super Six
Load: About 25 gallons of fuel on board two adults and two kids 12 and 9
Sea Conditions: 1' (calm)
RPM. 3500
Speed: 28 mph
Gas mileage: 3.04 miles per gallon
Not to shabby for an old 2 stroke

bgreene · #6 08-10-2011, 09:03 PM

Now that's what I call accuracy !

Interesting - that's just about what the old brochure indicated the boat range - around 180-200 miles max with a 150 hp.

So using your formula, those of us with clean hulls, and solid 150hp's can fish out 60 miles, 60 miles back......with 1/3rd reserve......better make that 50 miles out and back for more safety.

And ps.......bring along an extra full 10 gallons back up.

Thanks for your report.

Kaug23 · #7 08-23-2011, 08:11 PM

This weekend I hooked up my new Lowrance gps. With 3/4 tank I was getting 3.4 mpg at 4200, 3.6 mpg at 4600, and 3.1 mpg at 5100. This is with a 120 looper and bottom paint. I was in 1-2 foot chop with two people on board. If I dropped down to 3500 my mileage fell to 2.1, and at 5700 I was still getting 1.9.

bgreene · #8 08-23-2011, 08:49 PM

Original V21 brochure claimed 230 mile range so.........that would mean
3.8 miles per gallon at cruise with the 60 gallon tank.

Anyone getting that range ?

I can tell you this - by reducing my trailering speed from 65 to 55 my Ford Explorer towing fuel economy improved by 20% from 10 to 12 mpg.
So now I tow at 55 mph. A no brainer because over a 1hr drive that's 10 miles which only costs me an exta 11 minutes drive time.

randlemanboater · #9 12-01-2011, 01:40 PM

Quote:

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?

THEFERMANATOR · #10 12-01-2011, 01:48 PM

Quote:

Originally Posted by randlemanboater

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?

Yes. the XRI is a great engine, but it is known to be a thirsty pig as MERCURY made em run a bit rich so they would last longer on the bass boats. It is the same basic engine as an XR6, but the carbed XR6 was actually a little better on fuel I was told. It was a great running engine though, and always ran smooth and would troll for hours and never stall.