According to Official Guinness Records,
The fastest motorised chariot travels at a speed of 98.79 km/h (61.39 mph), and was created by Jack Wallace Jr and Mark Dawson (both USA) and achieved at the Willow Springs Raceway, Rosamond, California, USA, on 10 August 2013.
For a complete list of 2013 records, please visit 2013 Guinness Records in United States.