Record bodies, such as the SCTA (Southern California Timing Association), require exact averages over two runs (one in each direction) to account for wind. Therefore, the figure is a mathematically verified average, making the conversion to 324.847 km/h an equally precise scientific data point rather than a simple estimate.
In October 2016, at the Utah Salt Flats, a heavily modified Volkswagen Beetle known as the Volkswagen Beetle LSR (Land Speed Record) achieved an average speed of (324.85 km/h) over a measured mile. 201.851 mph to km