Rusty Cornfuel is a race car that races for the Tow Cap team in the Piston Cup Racing Series. He is a Brawny Motor Co. Spark GT that is painted purple and white, with the number 4 painted on his roof and doors. The Tow Cap logo is printed on his hood, as well as his trunk has it. Between the events of Cars and Cars 3, Rusty retires, and gets replaced by Jack DePost.
In Cars, Rusty is one of the thirty-six competitors at the Motor Speedway of the South against the likes of Lightning McQueen, Strip Weathers, Chick Hicks and many others. He is first seen racing alongside Floyd Mulvihill, when Lightning McQueen passes him by using the wall to squeeze through the gap between it and Floyd. Later, Rusty is involved in a huge accident caused by Chick Hicks, but does not suffer from any major damage, and is still able to continue racing, but does not win to a three-way tie between Lightning McQueen, Chick Hicks, and Strip Weathers.
"Rusty Cornfuel grew up on a farm in Mississippi and gained his reputation among the locals for running his own racing circuit with his buddies. Rusty won most of the races and made enough money off the event to nearly sponsor himself professionally. Luckily his current sponsor, Tow Cap Hitch Protectors, came along to front the bill for his team. Now Rusty can spend his own money on more important things, like flying his buddies from the farm down for every race."he even won a few piston cup races.