On Sat, 10 Nov 2007 20:04:18 -0500, Dan intrceptor@gmaildotcom
wrote:

Large boats with smaller engines would burn less fuel per hour, but the
MPG would be worse since they have to run the same distance, dummy.

In actual practice it does not work out that way. It takes a huge
increase in fuel consumption to run a large boat on plane. The same
boat run at something like 1.2 times the SQRT of waterline length will
average much less on a per mile basis. That's why people buy
trawlers.