Originally Posted by Submarine deckhand
We just bought a loop boat with twin lehman 275's
( president 43) we have the fuel consumption curves but I don't believe they mean very much in the reality
I'm a cheap bugger, and plan to go as slow as possible to conserve fuel, possibly running on one engine where allowable.
Are there any cruisers out there with these engines who have an idea of their real gph consumption.
Any input would be really appreciated.
If you want real fuel economy...and it only becomes truly meaningful if you are burning enough to really matter (the loop would certainly be that case)...
Buy a Fuel Scan fuel monitoring system (or equivalent)....hooked to a GPS and giving realistic NMPG will give you the best answer you want and allow you to ADJUST to whatever you want real time.
After about 1000 miles on my first "serious" trip...I had my boat/engine figured out to a nice set of AVERAGES...but at any given moment of bottom fouling, prop dings, current, windage, etc..etc...I couldn't really tell you if I was going the most "economical" and other times it didn't matter because I was in no hurry, or trying to make a bridge opening or dock before nightfall.
So bottom line is how accurate do you want to be and where in the fuel burn range is acceptable for you.
Daddyo on this forum runs twin Lehmans in a Defever and puts lots'o miles on every year. His engines are 120's I believe and he might have better info because he's twins. He's way down on the RPM numbers and sips fuel...if you ran down there I bet you would be close.