anchor201,
It has been a few years since I worked charters in the Carribbean (1979, I guess that's a few years) but I remember that most crewed charters ran at night while the guests were sleeping (or passed out drunk) so that they could spend the day snorkeling in a nice cove (or running the Tiki bar out of rum). I guess things haven't changed.
I have published some performance data for my 32' "Tin Lizzie" on my website at
http://web.me.com/dougmr...ebsite/Performance.html
Perhaps that will give you an idea. I am working on a diesel conversion page, in work, but it also might give you some ideas:
http://web.me.com/dougmr...nversion_to_Diesel.html I am not sure that the economy of diesels offsets other costs, except of course for commercial use. It makes sense in Florida where diesel at the dock is $0.15 cheaper than on the highway, while gasoline is $0.75+ more than the highway. The real argument for me is that diesel fuel is safer.
Doug
1975 32' Flybridge Sedan, twin Perkins 6-354 diesels, 1:1.53 velvetdrives, 16 X 19 props. Merritt Island, Florida