I have the military version. Pending on propeller, WOT is everything between 37,5 -41,5 knots.
That driving single, but always with all normal gear(anchor+ chain, tools, plenty of ropes, fire extinguisher and typically well fueled. Out of memory, think with the yam K series Ali prop 19 pitch, was abt 39,5 knots.
My cruising speed is, weather permitting, typically 28 +- knots, seams to move very easy at that speed. Fuel per distance is not much related to speed, don't notice any measurable difference on 22 vs 28 knots.
fun on a boat is inversely proportional to size...sort of anyway