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I have an 18 with a 150 rude on it. I have extra weight to push b/c I have external live wells on the transom. 25 gallons each. WOT on GPS is 38-40 knots. Gas is a problem because my average trip is about 60miles and only a 50 gall tank. I would go with the smallest possible to get the speed and economy you want. Im thinking about yamaha too. 150 DFI. Dont know yet.