my '95 3200 scr cruises at about 29mph at 3400 rpm, she has twin 5.7L with Bravo IIs.
boat is somewhat loaded (gas tank less than half full, water tank almost full, holding tank somewhat full, 2 adults, 3 kids, some cooler, and fridge pretty full, all adds to weight).
Also, I have I normally dont take down all the eisenglass when cruising either, just the mid-window and I open/unzip the captain's side. Probably adds drag.
Many variables can change your cruising speed.
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