Six knots is probably a bit faster than the true hull speed, but I don't
want to crawl quite that slowly. This is a planing hull, so it really
doesn't have a "hull speed" like your displacement hull. Using the 1.34
X sqaure root of the LWL gives me about that though. Fooling around with
the speed and a fuel management system shows me that the slower I go,
the better mileage I get. Going down to three knots gets me up to 5 nmpg.

I've thought about repwoering with diesel if/when my 5.7 goes bad on me
in about 2000 hours, but unless the price of fuel doubles and my hours
on the water double, I'm looking at about ten years for a payback. Not
worth it.

Capt. Jeff