Welcome to the forum.
What kind of outdrive ie Volvo penta single or duo prop, mercruiser etc.
I have 91 V and mine has the Volvo penta duo prop, my rpm is 4200 and mine runs between 41-44mph, per my GPS.
At 3000 rpm mine runs between 28-31 mph.
Hope this helps.
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Tis better to be quiet and thought a fool than open your mouth and prove it!!
1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
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