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385 offshore fuel consumption

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Topic author
EastTxHorn
Junior Member
Posts: 1
Joined: Thu Dec 24, 2015 2:08 pm
Vessel Info: 2016 Pursuit. 385 Offshore

385 offshore fuel consumption

Postby EastTxHorn » Mon Jul 29, 2019 9:06 pm

I have a 2016 385 Offshore. It has triple 350s. I've put about 350 hours on her and no matter what I do, I average .8 MPG on a trip. I'm curious about changing props? I would like to get 1.0. With only 375 gallons of fuel, my range isn't near what I would like it to be.


Tightline
Junior Member
Posts: 3
Joined: Sat Dec 29, 2018 8:22 pm
Vessel Info: 375 Offshore 2010 With triple 350’s
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385 offshore fuel consumption

Postby Tightline » Fri Aug 23, 2019 3:48 pm

I have 375 2010 offshore and I get under .8 with triple 350's. pushing over 20,000 pounds fast takes gas.

ChrisF
Junior Member
Posts: 12
Joined: Sun Oct 14, 2012 11:21 am
Home Port: Palm Harbor, FL
Vessel Info: 2015 Pursuit OS 385
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385 offshore fuel consumption

Postby ChrisF » Wed Jul 08, 2020 1:01 pm

My experience has been similar. Approximately .8 mpg at cruise.

You may want to consider a fuel bladder for longer trips off shore. I recently purchased a 75 gallon bladder for that exact reason and have been very happy with it.

http://www.atlinc.com/rangeextender.html

JToys
Junior Member
Posts: 3
Joined: Thu Jan 03, 2019 3:33 pm
Vessel Info: 2018 OS325
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385 offshore fuel consumption

Postby JToys » Sat Jul 18, 2020 9:15 am

2019 OS355 with trip 300's and I average .8 running 4100RPM and 32MPH. Factory suggests running around 3500RPMs at 27MPH to get .98 but the boat won't stay on plane at that speed and I burn .6!

Kismet
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Posts: 17
Joined: Sun Jul 19, 2020 10:39 am
Vessel Info: 2015 Pursuit OS 385
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385 offshore fuel consumption

Postby Kismet » Thu Sep 08, 2022 11:07 am

I know this is an old post, but fuel burn and limited range as a consequence is the ONLY thing I don't like about my 2015 OS 385.

I noticed the center engine burning more fuel than the other two and lagged behind in RPM getting up on plane by a lot.
So, I re-pitched the center prop to 16" from 17" to lighten the load on the center engine. The result was consistent RPM on the up take to plane, comes up on plane at a lower speed but takes a bit longer and burns exactly the same as the other two motors and now gives me an occasional .9 vs .7/.8 MPG.

My plan now is to replace the center prop with a 4-blade LFS 16 to see if that squeaks out any better fuel economy.

The prop is coming this weekend, so I will get it fitted and run some tests and report back.
Stay tuned!

Kismet
Junior Member
Posts: 17
Joined: Sun Jul 19, 2020 10:39 am
Vessel Info: 2015 Pursuit OS 385
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385 offshore fuel consumption

Postby Kismet » Sat Sep 10, 2022 8:00 pm

Follow on to my last post:
I installed the 4-blade, 16"pitch on the center engine and ran it through the RPM range.

Overall impression is very good.

While I am still not able to get 1MPG, I am getting increased speed at lower RPM and am achieving 29MPH at 3600 RPM with 3 POB and half-full tanks of fuel at .9mpg. This is a considerable improvement.

In addition, it comes up on plane at 12.5 MPH vs 15MPH previously and does so at 3200 rpm - another first.

I believe the 4-blade is pushing more water, adding lift to the transom quicker and not bogging down the center engine so the rpms of that engine are in the range of the other two.

Next, I need to play with engine trim and trim tabs at various settings to see if that will enable me to break the 1.0MPG barrier.

Peggy-O
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Posts: 8
Joined: Mon Aug 15, 2022 4:21 pm
Vessel Info: 2016 OS385
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385 offshore fuel consumption

Postby Peggy-O » Thu Sep 29, 2022 11:36 am

I'm very interested in this topic. I have the same issue. in perfect conditions I get .8, but any slop or extra load it drops into the .7's. Sucks for canyon runs. I'm not a fan of fuel bladders. Please post results and set up. Thanks.

Kismet
Junior Member
Posts: 17
Joined: Sun Jul 19, 2020 10:39 am
Vessel Info: 2015 Pursuit OS 385
Been thanked: 1 time

385 offshore fuel consumption

Postby Kismet » Sun Oct 02, 2022 3:59 pm

Will do as soon as this blow fades...

Peggy-O
Junior Member
Posts: 8
Joined: Mon Aug 15, 2022 4:21 pm
Vessel Info: 2016 OS385
Been thanked: 2 times

385 offshore fuel consumption

Postby Peggy-O » Tue Oct 11, 2022 10:50 am

Any luck? Sent you a PM.

Peggy-O
Junior Member
Posts: 8
Joined: Mon Aug 15, 2022 4:21 pm
Vessel Info: 2016 OS385
Been thanked: 2 times

385 offshore fuel consumption

Postby Peggy-O » Mon Oct 24, 2022 10:57 am

Just checking back in to see how you made out?

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