What is the record mpg for a car?
As of 2023, the world record for the highest fuel efficiency (mpg) achieved by a car is held by the Toyota Prius Plug-in Hybrid, which managed to achieve an average of 387 mpg (1649 km/L) in a closed course under controlled conditions. However, it's important to note that the Prius was modified to optimize fuel efficiency and was not available for public purchase in the same configuration.