I meant to say foremostly, I don't know Vitaliy M. personally but did communicate with him online after his traverse and read his accounts. There has been fairly decent record keeping and research on this (e.g. Jediah Porter, www.jediahporter.com/2012/10/sierra-speed.html). Vitaliy's time is presently considered the FKT by myself and those I've spoken with who've also done the route.
Doing this car to car is impressive no matter what time you log. Austin did the 24 hour car to car after doing the route a year or two prior. Vitaliy did it on his first attempt on the route. Is there a report from Aaron Richards?