My grandfather used to fly back and forth between his home in England and the United States a lot in his Piper Comanche. He had 20 hours of endurance or about 240 gallons with the largest ferry tank. He did around fifteen round trips in it. It is not my cup of tea, but he has always been the adventerous type. His best friend had 40 hours of edurance in his Comanche and flew nonstop from London to LAX, 36 hours.
Alex.