Any speed that I quote are for loaded tourney loads, 2 guys, full fuel and gear. The new V10 is a torque monster and between that and the new lower unit they swing some big pitch props (I don't recall what pitch however) compared to what we've been used to running on the I6 Verados. The numbers I mentioned above with the New V10 were on a dealer spec'd boats (not proped for top speed, propped for overall performance). I fully expect a 2-man tourney load to run over 70 mph on my new one. I'm a boat performance junky and have spent more money than I care to talk about to get my boats dialed in to perform as good as they can. We all have our vice's. TBH, if this one runs the way I've been told and seen from a few videos, I have probably hit my limit for chasing speed in a walleye boat.
My current 2018 219 350 combo is a 63-66 mph boat. I have seen 67 mph and change but that was on an unloaded boat. On any given tournament start, it'll run 64-65 mph. Humid air, its down between 63-64 mph. Running a 22.5 Pitch Bravo FS that's been worked by Croxton. very few people can pass me out of the gate, it's not setup for every last mph.
Previous 186FSX with a 200 opti would spin a worked DAH Tempest plus and push that boat 58-60 mph. it was one of the fastest 18.5 ft boats I've seen or been around.
had a 2011 Skeeter WX1900 w/ a 200 hpdi. could never get that one to run, was a 50 mph boat no matter what I did.
.........and if I go way back, had a 2000 Yarcraft Storm SC powered by a 2006 225 Opti. That one was ran decent also, pretty much the same 58-60 mph speeds I got out of the 186. That one was running a worked Tempest also. Previous owner of that boat said 61 mph but he was another 1000' lower in elevation.