A Koenigsegg Agera RS driven by factory driver Niklas Lilja has recorded a 2-way avg speed of 277.9 mph. A new world record!
When will Hennessey take their car and prove it's faster? This same source, The Drive.com says that it's a 301 mph car
But... they haven't built one. http://www.automobilemag.com/news/2017-sema-show-hits-misses-revelations/