I got my boat back on Saturday with the new twin 175 Suzukis on her. I could not be more happy. I am going to experiment with my props because I think the ones on her might be a little small. The current props are the 3-15-19. I am looking to jump up to the 3-16-20l. I read another post that someone was running those props and hitting around 49 miles per hour. I am only hitting 41 or so with the smaller props. The top end does not concern me I want to find the most efficient mid cruise speed. I figure larger prop more water being pushed at lower rpm's. Am I way off anyone with experience please chime in?