Under the hood sits a twin-turbocharged 6.6-liter V-12. It pumps out 563 horsepower, making the Dawn as fleet as it is sexy. At the test track, the Dawn rushed to 60 mph in just 4.3 seconds. It moves gracefully and deliberately, and it cossets passengers even when driving over the harshest potholes. The eight-speed automatic transmission is tuned for tranquility. It uses GPS to determine when it should change gears, considering whether the car is going uphill, downhill, or around corners.