Cruising speed is a result of efficiency. As noted above, no published data can be used to determine the best cruising speed for your boat. It depends on loading, hull condition, sea condition, props, attitude, etc. The only effective way to determine the best cruising speed for your boat is with a fuel flow gage and a tachometer. You can start around 80% of WOT and adjust your speed to achieve the point when your GPM flow decreases the most. Then you can adjust your trim tabs and tilt to see a rise in RPMs with no throttle change. With the price of fuel these days, you are well served to find the ideal cruising speed for your boat under a variety of conditions.
