"DSK" wrote in message
...
actually, it's pretty simple, go slower


NOYB wrote:
Slower than what? Planing hulls going slower than planing speed are
much
less efficient.

Nope. This is a common motorboater's misconception.

If you doubt it, look at the fuel test results commonly printed in
magazines.

Just checked June 2004 Powerboat Reports, page 13

Boat/engine: Triumph 210 Chaos center console with single Honda 4-stroke
150hp

Mileage at 1500 rpm (6mph): approximately 6.2mpg
Mileage at 2500 rpm(9mph): approximately 3.5 mpg
Mileage at 3000 rpm(25mph): approximately 6.5mpg

So in this example, the most efficient (best mpg) speed is when the boat is
on plane at 25 mph. In two-strokes, the difference would be even more
dramatic since two-strokes consume significantly more gas than 4-strokes
when travelling at trolling speed.