J/30 Class Association Forums J/30 Forum Cruising Discussions Preferred cruising RPM ?

On Rhapsody with 2GM raw water cooled (13 hp), 2200-2300 RPM provides a good cruising speed, and the fuel consumption is good (about 0.3 gallons per hour). Vibration (resonance related) is also good in that range. When you kick the RPM up to 2800 fuel consumption is almost doubled with only a few tenths of a knot speed increase.