They have mislabeled it as the Silver State or the wrong month. Probably called it the Silver State when it was actually the Nevada Challenge. The Silver State. same highway, same rules, but in September when it's hotter hence a tad slower. But remember, in all but unlimited class they have a specific mph average they're shooting for over 90 miles. I know from my own travels in the great wide open, I'd drive all day at 80 and after a gas stop end up with a 55 or 60 average. So at times they had to hot foot much faster, like that transit van traveling at 164.
Looked it up, it was the Nevada Challenge in 2012, Jim Peruto, 2006 Dodge Charger, avg 217.5570, high trap 243.7.