As of my last knowledge update in September 2021, the Bugatti Chiron Super Sport 300+ held the title of the world's fastest production car. It achieved a record speed of 304.773 mph (490.484 km/h) in August 2019 on a closed track. However, it's important to note that there have been developments and advancements in the automotive industry since then, and there might be newer cars that have surpassed this speed record.
To obtain the most up-to-date information on the world's fastest car, I recommend referring to reputable sources and automotive publications that specialize in reporting on the latest car records and achievements.
