on the dusky i mentioned, the hulls are very similar to v20's, there is a noticeable difference in 2s vs 4s as far as hole shot, acceleration & planing speed. that was with the same hp. if you drop down 50 hp and go 4s, you will be aware of it. the dusky is a fishing boat with 3 or 4 old fat guys on it, so speed is not important. if you do a lot of tubing, skiing, etc, it will be more of an issue. i'm sure you can ski & tube behind a 4s, but it's not going to pull up up like a merc 200.
on that same boat mpg went from 2 to 3.5
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