Mercury Marine's new Verado four-stroke outboard drew a huge crowd at the Miami Beach Convention Center. Mercury has worked on Verado for the past five years. As one engineer told me, "The only part that isn't new on the motor is the prop nut." The 2.6-liter, inline six-cylinder motor, which will be available in 200-, 225-, 250- and 275-horsepower models, offers four-stroke fuel efficiency and low emissions with two-stroke power and performance.