Gould,
I thought you got better gas mileage in gallons per hour right after a
planning hull gets on plane, but you got better gallons per mile at
"cruising speed". I was wrong.

I checked out the actually gas consumption used in boat tests and it appears
that while the gallons per mile varies from boat to boat some being better
at planning speed, some better slightly higher than planning speed, and some
are actually higher at 4000 rpm, with Cruising Speed being 3000 rpm.

So it would appear that Gould's statement cruising speed is based upon the
highest RPM that will not stress the engine is correct, but their are some
boats that actually got better MPG at higher than cruising speed.


"Gould 0738" wrote in message
...
The Parker planes in the 16-17 mph range, but if the conditions warrant,
I typically "cruise" the boat at 25-30 mph. The engine seems to have a
wide "cruise groove" range

Your Parker gets better fuel economy at 25-30 mph than on plane at 16-17?

Very unusual, indeed. I'll have to see if there are some test results that
show
others have had a similar experience in the same boat. Could it be that
trim or
something is unnaturally and seriously *reducing* your Parkers nmpg at the
slower velocity?