Gray is a character in Cars.
"Gray always knew that because of his size he'd be hauling cargo across country; gas, lumber, maybe even steel like his dad, but he never dreamt that the cargo would be seven time Piston Cup Champion, "The King" Strip Weathers." 
- "Cars Finder" (supplementary material on Blu Ray Disc release of Cars). 2007. Blu Ray Disc. Walt Disney Home Entertainment, 2007.