"Joe" wrote in message .. .
You forgot to answer my question-

Here's real world scenario for you- On my boat (21.5' CC 200hp), at 3000rpm
the boat will ride with a bow high attitude with stern dive. As I actuate
the trim tabs the stern rises, the bow lowers and the boat planes. Once
planed the rpm's will immediately climb (without touching the throttle) and
my speed increases. I then can reduce throttle back to 3000rpm and continue
along on a plane.

Now, tell me, do you think my boat is more, or less efficient at 3000rpm's
with my tabs down or tabs up?

Uh, you are changing the subject here. You previously said more FUEL
efficient, now you are simply saying efficient. As far as fuel
efficiency goes, 3000rpm is 3000rpm, whether the boat is running flat
in the water, or straight up, so no, your fuel effeciency hasn't
increased. Your ride may be better, at the SAME fuel rate, but your
fuel effeciency hasn't changed. Do you not understand that? Do you
also not understand that when you use a tab, you are sticking a metal
plate out to drag in the water? Now, again, answer me....do you think
it is more fuel efficient to create drag by using trim tabs, or to
distribute weight to achieve the same ride characteristics?