Thread Tools Display Modes
Old 06-21-2015, 11:35 AM   #1
Gordon B's Avatar
City: Titusville,Fl
Country: USA
Vessel Name: Moonstruck
Vessel Model: 41' Defever
Join Date: Jan 2015
Posts: 23
GPH ford lehman 225

Hi to all,
I've watched this forum for along time but this is my first post.
I'm sorry if this has been addressed elsewhere.
My wife and I are in the "looking" process for a liveaboard trawler to cruise the Florida coast (within a year). We are curious about GPH for twin ford lehman 60 elpt 4s 225 on a 37-38 foot trawler from the 1980's era. We would really like to go with a lot smaller engines but for some reason many of the smaller trawlers that we like have high horsepower engines.
So, I guess the question is if you go slow (7 or 8 knots) what can the expected GPH be.
We don't want to go fast, but can going slow damage the engines?

Thanks for all the help.

Gordon B is offline   Reply With Quote
Old 06-21-2015, 01:16 PM   #2
BobH's Avatar
City: Montgomery, TX
Country: USA
Vessel Name: Compromise
Vessel Model: Present 38
Join Date: Feb 2012
Posts: 722
We own a 38' Taiwan Tub with twin 225s. Haven't used it as much as we would like, it's currently for sale, but we have made several trips of about 30 nm. We have Floscan instruments and I did a spread sheet of mileage, speed and nmpg. We have done as good as 2.88 nmpg at 7 knots to as low as 1.45 nmpg at 7.3 knots. Big difference being wind and current. Last time out we did 1.57 nmpg at 8.4 knots going and 1.79 nmpg at 8 knots coming back. This is generally running at 1320 RPM. There is one trip at 3.49 nmpg at 5.6 knots. We had a boat following us in a dense fog and kept having to slow down to wait for them. The speeds are the average based on total time and distance.

Hope this helps,


(buy the boat and I'll throw in the spreadsheet)

BobH is offline   Reply With Quote
Old 06-21-2015, 02:09 PM   #3
Nomad Willy's Avatar
City: Concrete Washington State
Country: USA
Vessel Name: Willy
Vessel Model: Willard Nomad 30'
Join Date: Oct 2007
Posts: 11,907
Keep looking. Looking is fun. Enjoy it. There are some boats out there with small engines. And they work better than anything at their speed range. Full displacement boats are not very numerous but good for you in that they aren't more expensive. This despite the fact that many here complain about their fuel consumption. Just keep looking and don't depend on Yacht World boats. Others selling independently will usually have lower prices.

Be honest about your needs for power and low fuel consumption. For most people it's less (frequently far less) than they think or anticipate.

Good hunting and have a good time looking.

North Western Washington State USA
Nomad Willy is online now   Reply With Quote
Old 06-22-2015, 07:26 AM   #4
Gordon B's Avatar
City: Titusville,Fl
Country: USA
Vessel Name: Moonstruck
Vessel Model: 41' Defever
Join Date: Jan 2015
Posts: 23
Thanks for the info. I see that higher horsepower doesn't necessarily mean high GPM if you take it easy.
This will help in the "boats that qualify" search.

Gordon B is offline   Reply With Quote
Old 06-22-2015, 09:32 AM   #5
City: gulf coast
Country: pinellas
Join Date: Jun 2014
Posts: 1,756
speed is the greatest factor in fuel use. Engine size is almost irrelevant. Keep the bow down flat and the wake at minimum for best economy and fastest economic speed. Slow down to 4-5 knots and fuel use will go down significantly.

Cruising FL fuel will be one of your lower expenses. Go buy a boat and don't obsess over fuel use that in boats is absurd anyway.
bayview is offline   Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -5. The time now is 06:34 PM.

Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012