But don't let its aerodynamic profile and express cruiser deck arrangement deceive you. The 390 Motor Yacht is intended more for cruising comfort than sporty performance. Still, it provides enough oomph to run inlets with confidence. Turn the key and shift into gear. The boat rises to plane without exceeding five degrees of inclination. Of course, from the height of this helm, you're not likely to lose visibility over the bow (although we've tested some boats that pushed the inclinometer's bubble to eight!). Five degrees is the boat's natural running angle-without tabs-at cruising speed. You'll top 30 mph with the levers pinned to the helm. The twin 370-hp MerCruiser 8.1S Horizon engines provide enough punch so that you accelerate with authority-although you'll never "jump." Minimum plane, achieved with trim tabs fully deployed, occurs at 15 mph. Get caught in a blow, and you won't have to bang your way back to the dock to stay in control. Loop around, parallel your wake, and come to a stop. Laying beam-to, our own wake revealed that the 390 Motor Yacht rolls without undue snap. Best economy? I found it at 3500 rpm, where speed is 21.8 mph and the boat burns 34.4 gph for a range of 171 miles.