I have a 2013 pt175tf with the 60hp and run 34-35+mph and is super quiet and my neighbor has the same year only txw with a 75 opti. His runs 40-43 mph it is a little heavier and burns a little more fuel. I read the the opti is no longer in production so the four stroke is you only option with a Merc.
May all the fish tales you catch be longer than the ones you tell !