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I'mnot an expert either, but actually I'm pretty sure trim tabs increase fuel efficiency and I know they increase top end. This of course depends on how you use them. If you put them down they will drive the bow into the water reducing top end and fuel efficiency but allow you to cut through the waves better or get on plane quicker. But putting them up slightly (or straight out) gets more of the bow out of the water when you are crusing and reduces drag which would increase speed and fuel efficiency.
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