Mary Bruce

...aka The Honorable Mrs. Victor Bruce. She was a pilot in the early 20th century and also a speed car racer. She once drove a car for 70 hours straight. She was the first woman called into the London police court for speeding on her brother's motorcycle, when she was 15. She flew across the world after a few weeks of flying lessons. When she was 81, she drove around a racetrack at 110 mph.

According to the website I linked to above, she said that going slow always made her tired.