I have a 2003 21' that I repowered with the new F200 4 cylinder last spring. I doubt it is enough for a 23', although it is surprisingly strong in the mid range and is slightly stronger than the the 200 Merc EFI it replaced. I get about 42-43 mph top end and my best cruise is around 25 mph @ 3.8 mpg. Overall in a day of running 20-30 miles offshore slow trolling for 4-6 hours I almost always end up averaging about 3.0 mpg. I feel is is very adequate for my 21' but would be very marginal for a 23'. Hope this helps.
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