I have twin 115 Suzuki 4 strokes. The boat runs 25.5kts at 4000 rpm's burning total 10.5 for about 2.8mpg. 5950 rpm's runs 38-39kts.(44mph) I love the setup, the weight keeps the ass planted in rough seas, I can keep her on plane at 16.5kts in nasty seas.
Combined weight is about the same as a Single 350 yamaha. Weight is manageable but at or near it's limit. A single 300 is the way to go IMO.
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Capt. Brian
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