The engines are said to burn between 1 and 7 percent less fuel than their antecedent generation and cost some 10 percent less to own. When asked just how Volvo Penta achieved these milestones, the engineering team answered directly and with copious examples. To wit, the common rail fuel-injection system now features higher pressure—2,000 bar, which is 25 percent higher than the previous 1,600 bar. Controlled by a new engine management system, this enables more precise calibration and control of injection parameters, so the engines run even smoother and are more fuel-efficient. While other details—such as a fuel filter with a sensor and a new a diamondlike carbon (DLC) coating on the piston pin that reduces friction and increases durability—proved cool, I was really wowed by some insight into the actual manufacturing environment. Utilizing practices such as pressurized assembly spaces to eliminate dust and grit in the air ensures the mating internal surfaces of moving parts start off with the best chance for long-term reliability. I mean, a boater shouldn’t underestimate the deleterious effects of an errant mote or shaving at 2,800 rpm—suffice to say, so-called “clean manufacturing” methods offer concrete merits. And the new boost/charge air system, with its larger supercharger and smoother handoff between supercharger and turbo, resulted in torque I could feel from the helm of the test boats.