The Enertia ECO was designed for high-horsepower outboard-powered boats. Mercury claims a 10 percent increase in fuel economy at cruising speeds. To maximize the fuel economy of the Enertia ECO, Mercury engineers designed the propeller with a 16-inch diameter, large blade area and high progressive rake, a combination made possible with Mercury’s proprietary X7 stainless-steel alloy. The patent-pending design and material combination resulted in a propeller that increases hull lift, which can make a boat more efficient by reducing overall drag. It also has lower planing speeds and higher top-end speed and hole-shot performance.