You're going to love the 300 Zuke. I got mine project finished back in Feb with about 115 hours on it so far and it rocks. My boat is not a Seacraft, but a 1973 23' Tsunami (Capt. Chuck can give more details on that boat). It is a foam filled tank, but it rides a little bit faster than the 23' Seacraft. I'm turning a 16"x20" Suzuki 3-blade prope. I posted numbers while I was breaking it in that are a little bit off. The guys that installed the engine didn't hook the multi function gauge up to my gps so my MPG readings were coming from the engine pitot pressure. I'm heading out again tomorrow and will keep a log and post my numbers with speed, rpms, gph and mgp(using gps speed). I can tell you that I cruise at 28 - 30mph @ 3750 rpms burning 8.74 gph = 3.20 - 3.43 MPG!