Though it's highly unusual to measure fuel economy in boats, there are two things to look at:

Hours per gallon. Given you aren't likely to measure distance, I'm assuming you want to know how to stretch a gallon of fuel as long as possible while on the lake. The simple answer to this is to keep the revs as low as possible. Lower revs uses less fuel, meaning the tank will last much longer in terms of time.

Miles per gallon. This is the standard for automobiles in the US. Typically, in cars at least, you want to keep revs at the peak torque for the engine in order to maximize fuel economy. This might be true for boats as well, but I'm not an expert in fluid dynamics. I'm certain that the variance in water conditions probably causes this number to be fairly meaningless. To measure the peak torque revolutions per minute, assuming you can't find this information online, you would have to have the engine dynoed somewhere.

Again, it's kind of a difficult question to answer and depends entirely on how you look at it.

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