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Old 07-30-2015, 10:40 PM   #17
Senior Member
City: MD
Country: USA
Vessel Name: Blue Yonder
Vessel Model: 37
Join Date: Mar 2013
Posts: 346
As far as ads are concerned, I think cruising speed is calculated at the maximum continuous rpm as listed by the engine manufacturer. Max speed would be at WOT. The individual boat owner probably picks a cruising speed (rpm) where the fuel consumption, noise and boat feels about right.

For my boat (planing hull) cruising speed would be about 24 knots at 22gph. Max speed is 27kts at 30gph.

I like to cruise at 18 kts and 14gph. On a relatively calm day, with no arrival time pressure, I cruise at 7.5 kts on 2 gph.
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