I finally got out to run the motor last nigh and to get accurate information. This is what I found with a half tank of fuel and one passenger with the 17 inch prop.
3500 rpm 20 knots
4000 rpm 25 knots
4500 rpm 31 knots
5000 rpm 34 knots
5750 rpm 39 knots
5900 rpm 38 knots
One thing I noticed when running the boat with a 2-3ft flowing swell, is the motor would go from 25knts to 21knts then back to 25knts after 30 to 60 seconds.
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