I think my top end is around 37-40 mph,not real sure. I’m an old guy, more interested in mpg than speed. Cruise at 31-33 and get a legit 3.75 mpg. I don’t have a fuel gauge, so i track miles on my gps. I go 120 miles between fill ups and usually take close to 40 gallons, avg is a little over 3 mpg.
I have not played with the prop any. I have an aluminum merc prop, 17 pitch.
Also, mine is a cuddy with the fuel tank back against the splashwell. I think the tank in a CC helps on getting on plane.
This is the third 150 merc I’ve had on this boat. Original 84 Black Max, 94 150 Mariner and the ‘15 150 4S.
Gotta admit, i do miss the 2S. Boat seemed more “nimble”. .