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You can forget aero with a pontoon boat. They’re basically like a low height sail that you use a motor to push air out of the way with.
About the only thing you can do is make sure the boats gauge package includes a way to monitor GPH (gallons per hr) use of fuel. Most new boat motors are capable of this by way of the ECM. Just make sure the gauge package is capable. Then it’s just a matter of finding the sweet spot between trim angle and throttle input to get it dialed in for maximum fuel efficiency.
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