Their's a very interesting article in this months Soundings about a
start up company in Florida that's developing diesel outboards with
some high hp output, most that are around now are low hp output. They
apparently have a working 2.3 liter prototype that put's out "about
200 hp". They had it on something like a 20 foot boat, fuel burn at
WOT, something like 5.6 gph. The article indicated that a typical
outboard of about 200 hp burns about 12 or 13 gph at WOT (I'm doing
this from memory, so I could be off a little). They never gave fuel
burn rates for a normal cruise RPM's, but I'd guess your probably in
the 4 gph range with WOT numbers like that. I'm not an outboard guy, I
like my inboard diesels, but somewhere in the 4 gph range is
impressive (might even be less). Their developing a 3.0 liter engine
as well. The weight of the engine wasn't bad either, like a typical
outboard of the same output. The engines are apparently rated for an
8,000 hour life as well. The prototype had a Mercury lower end (their
working on their own design), and the guy who wrote the article had a
chance to try it on a boat, so it's more than just a pipe dream. I
wouldn't be surprised to see one of the large engine manufacturers buy
them up if the engines look like their the real thing. I sure hope the
article wasn't an "April Fools" joke.