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Well I'm ready to chime in now. I just ran my 1963 Nauset for the first time in 15 years. It has a freshly installed 100HP Yamaha 4 stroke (2001 carberated). Here's what I got today with 5-10kt winds and slight chop. I maxed out at 6200RPM (I likely have the wrong prop). At full trottle I got 42.5 MPH. At a cruise speed of 3700 RPM, I ran about 23 MPH. At 4000 RPM, I ran about 28-29 MPH. In an hour and a half I burned about 3 gallons of gas (15 minute no wake each way) - the rest of that time was between full trottle and cruise. Of note is my boat is on the heavy side with alot of wood decking in the bow, and stern seating as well.

When I put the right prop on, I will probably loose a couple of miles per hour on the top end.