I use mine often to fine tune the boats trim under way while in conjunction with the trim tabs. Tilting the motor up will lift the bow somewhat. If you are heading into a chop and want to pick up the nose a little just raise the motor a little while underway. The trim tabs are better to reduce any roll angle induced by the engine torque or incorrect boat loading.
The trim tabs can also be used to move the bow up and down but most are better at moving the bow down and taking out roll.
For minimum resistance, (ie best gas miliage) try an use as LITTLE trim tabs as possible, if you can adjust the boat trim the way you like it with the engine tilt you will be running most efficiently.
Normallyhere is what I do: I get the boat up to the cruising spreed I intend to move along at, then I lift the tabs all the way UP (ie out of the water) then I trim the boat with the motor to the ideal trim (bow up/bow down) angle for the sea condition, and finally I take off any roll with the one tab. This works for me...you mileage will vary
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