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post #22 of Old 05-10-2013
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Re: fuel consumption gas vs diesel

Originally Posted by JohnRPollard View Post
An old thread, but what the heck...

Over the course of 8 seasons, our current 3 cylinder 27hp diesel has consistently burned about 1/3 gph during normal sailboat operations. We push it hard (2700-3000 rpm whenever we're motoring, except when docking and during warm-up/cool down).

Our previous 2 cylinder 18hp diesel burned about 1/4 gph during normal sailboat operations.

Hello, new to your forum...
By "normal sailing operations", did you mean your motor is running to assist your sails, or running alone, under full load???
Is your diesel motor really that efficient?

A dumbfounded gas user.
-Planning to build a fuel efficient trimaran for inter-island travel, Hawaii.
-Mahalos from Maui.
That sounds about normal for gph under power alone. What have you used that was gas powered? Remember sailboats are generally displacement hulls, so you are not talking about speed, likely 7 knots at most depending on length. I don't see inter island travel to be that patient, unless it is for tourists and is a stay aboard. Why spend a whole day when you can get a cheap flight for short money (especially with the kamaaina rates). Now if you are talking typical ferry speeds you will spend a lot more!
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