Our test boat sported a pair of Yanmar 310-hp diesels with24-inch Mercury four-blades on Mercury Bravo XR sterndrives.Diesels need the muscle of the beefier XR drives. With thatpackage, the 38 cruised beautifully at an impressive 46 mph. Thoughwe topped out at 51 mph, the rpm hit the limiter at 4,000. Back atthe dock, Reggie had the props changed for a pair with 2 inchesmore pitch. We came back out with the new props and discovered(logically) that acceleration suffered, but we got a top speed of53 mph at a lower rpm. With diesels and sterndrive efficiency, this38 turned out to be a relatively fuel-stingy boat, even at thespeeds it can run.