[Gerry Zagorski]

It depends, each boat is a little different and conditions vary as well...

In general, if you're running in flat conditions you want to trim it up as high as possible without the prop cavicating... This will left the bow and reduce the amount of wetted surface of the hull and the less hull you have in the water, the less drag and more efficiency you'll have...

Having said that, raising the trim up in less then ideal condition will make the bow come up, could cause excess porpoising and if your going fact you could launch the boat out of the water off waves... In this case you'd need to trim it down to keep more of the bow in the water..

The other thing a lot of people do to get up on plane faster is trim the engine all the way down when taking off and once up on plane, trim it up...

Best thing for you to do is play around and see how far you can trim it up and still get a comfortable ride in the conditions you are in at the time.