I have a 1988 Sailfish 25 ft. hardtop with a Mercruiser 454 - 7.4 Liter. It is rated at 330 HP. I have a FloScan on it for accurate fuel readings.
Here is a typical cruise speed for me - 22 / 24 MPH at 3200 RPM using 12 GPH. I usually run with 50 - 60 gallons of gas on board, three...