Our 4,600-pound boat sported a single 225-hp, naturally aspirated Mercury Offshore outboard, and I admit feeling skeptical about pushing this boat with so little power. But once up and running, a top speed of 46 mph eliminated any further doubts. As you know, you rarely get to use top speed on boats offshore, though most boats come from the factory propped for maximum top-end performance. Personally, I'd rather prop my boats for the most economical mid-range. In the case of the 251, a 32-mph cruising speed showed 4,000 rpm on the tach and proved very comfortable. Of course, a single engine will provide much better fuel economy than twins.