Brad, I know a guy who has a '91 jonny on his V20 Fisherman and says it does about 60mph. That's a little fast to me but a midrange RPM V-6 that old will get the same mileage as a 4cly. of the same year at top end. I just sold a boat that was slighly underpowered and I regretted that decision. If you don't mind a little more gas consumption get a low HP V-6, they just perform better. It is true that Yamahas are a bit more reliable, but Mercs have much more power and they use a great V-6 system of Optis. You sound like a faster kind of guy, and there is no problem considering EFIs. Like the Merc 2.5L's.
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 My Father circa 1985 holding a grouper and red snapper behind his 27' Scotticraft, Seaducer, with twin mercruisers - a member of the Bucket-Bow Boats.
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