Got to run the boat today, shake down cruise with a very light boat, only 40gal of fuel, no gear, 2 batteries no enclosure.
Best cruise I saw was about 31kts, 4000 RPMS, 1.6nm/gal.
Top end with 4 blade props, 44kts at 5700 RPM's.
My normal cruising speed in 3' waves (typical Atlantic sea...