I would expect hull speed or maybe 1/2 knot shy.
(HS = 1.34 x √LWL
Not sure but assuming 27 foot waterline maybe 6.5 or 7 knots? Fuel economy should be great. Maybe 2.5 -3 mpg would be my guess. 3-4 gallons per hour?
Enjoy the boat. Are you on the Vinyard?
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