I own a 2005 2520xl with a 2016 Yamaha 300 on a bracket. At best, running a SWS2 15.5 x 17 max rpm is around 5300 ranging on load and sea, top end is 38-41mph burning 26.1gph; cruise is 4300 at 28-29mph and 15.5gph. The boat is has bottom paint, Westerbeke 5kw gen set, second station on bulkhead...