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Old 12-15-2016, 02:01 PM   #2
kapnd
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City: hawaii
Vessel Name: #31
Vessel Model: ex-Navy MUB 50 fish/cruise
Join Date: Aug 2013
Posts: 873
I think your friend's Meridian gets that 2.1 gph @ 8.4 mph on each engine, not both.
Not sure exactly what your question is, but I will say that hull and powertrain design do have everything to do with fuel economy.
A full displacement hull with properly matched motor/trans/prop will, in terms of fuel efficiency, outperform a semi disp or planing hull of the same size at the same speed.
All that aside, people who "do the loop" usually buy their boats based more on creature comforts than a few bucks worth of diesel.
Full disp hulls usually pay a draft penalty over their flatter bottomed cousins, and do not offer any significant speed for situations where that is desired.
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