On Tue, 18 Mar 2014 06:52:15 -0500, Boating All Out
wrote:

Here's a power cat that will get 29 mpg at 5 knots.
19 mpg at 8 knots.
http://www.multihulldesigns.com/desi...ock/38tri.html
You can accept or reject that mpg figure.

===

Those numbers are wildly optimistic in my experience. Basically you
are talking about the same hull as a lightweight 38 foot sailboat,
typically burning between .5 and 1 gallon per hour depending on speed,
wind and seas, while doing 6 to 7 knots. Even the most optimistic
ends of that range only gets you to about 14 mpg. That might be
attainable if very lightly loaded in perfectly flat, dead calm
conditions. More typical would be 6 or 7 mpg.