O Yachts just launched its first powerboat, Power Class 6, a “smart hybrid” that can run on all-electric power or on a combination of diesel and electric power. The 63-foot cat, made in Latvia, is innovative, spacious and extremely fuel efficient. In fact, it burns less than one liter (0.264 gallons) of fuel per mile at 10 knots. O Yachts says the boat underwent two years of testing in the Med to get the right combination of power. It has two versions. In the hybrid version, the company says the boat has a range of 3,000 miles. With a combination…