Surf Scoter has a 65 hp Westerbeke inboard, generating a top speed of 24-25 knots with one person aboard and some 23 knots with two. We cruise comfortably at 17-18 knots, and get about 2.4 gallons/hour.
We selected it for use as a “mother ship” so we can run over exposed waters from one protected embayment to the next, planning to paddle our folding kayaks off the stern. Having a huge cockpit area with a combination engine box, sit-upon, and tabletop in the center of our “living room” makes this a good boat for two gunkholers. Sleeping aboard has been very enjoyable for us. We plan to use it a lot, both on the lower Columbia River here in Oregon and up in BC.