Me n bigcat did a fairly decent test on 2 vs 4 last year on our boats. We both have 20' center consoles, he has a 115 2 banger and I got a 115 4 banger. Both hulls very similar in weight etc, we ran down and up Bbay one day, following almost exactly the same track..
The results were pretty predictable. Same speeds....My boat used a little less gas than his, and he had to deal with 2 stroke oil costs too.
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