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Since there are a lot of 23 cc's with o/b here, I can chime in and say that my i/o's top end has been around 41 mph burning about 20 gph. My optimal cruise is right around 27-28 mph, getting 2.8 mpg. This is with a mercruiser 250/carbed/alpha.
It does ride like a tank when i need it to. The funny thing about fishing space on this boat is that I fish most often with two guys and the engine compartment makes an excellent casting platform in the back.
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Oldfielder,What's your WOT RPM?
I also have a 23 footer(Tsunami) with a 350 I/O with a Merc Alpha drive.I wish I could get 41 mph top speed.
I'm only getting around 36 at wot.
Maybe it's the weight difference and wind resistance,between the ctr console and Tsunami/Sceptre models.
It cruises nicely around 27 at about 3400-3500 rpms.
It was originally a 305 but the block was replaced with a new 350 short block.They transferred all the other parts to it,and I put a new intake and a 650 cfm Edelbrock 4bbl carb on it,so I'm assuming that I'm around 240-260 HP.
A mirage ss prop that seems perfect.Maybe it's the weight difference for the slower speed.
Also,the stand up canvas work,the radar arch,and some wet foam in the stringers may also be slowing me down.
Either way it rides awesome.It's stern heavy but it jumps on plane very fast,and the tabs easily correct any other ride issues.