Re: Marine diesel
First, that is not an apples to apples boat. Ski boats are usually flat in the back, have alot less wet hull area, and run on flat lakes, not the open ocean, compared to a 23' seacraft. IMHO, you could probably get close to the milage in a 4 stroke outboard, all boats being equal. I think that type of inboard would give you a little better milage (10-15%), and the outboard would give you better performance, it's a tradeoff, that's just my opinion.
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