What is the title of the first Cars Toons short featuring Mater?

The first Cars Toons short featuring Mater is titled Rescue Squad Mater.

Rescue Squad Mater premiered in 2008 as the first short in Pixar’s Cars Toons series. The series centers on Mater telling exaggerated stories about his supposed past adventures, with Lightning McQueen often appearing as his listener and friend.

In Rescue Squad Mater, Mater imagines himself as a fire-rescue vehicle. Like many Cars Toons stories, the short expands the character’s comic personality through an increasingly elaborate tale rather than continuing the feature films’ main plot in a straightforward way.

Cars Toons was originally known as Mater’s Tall Tales. Later shorts include Tokyo Mater, El Materdor, Monster Truck Mater, and Heavy Metal Mater. The title can be confused with the series name, but Mater’s Tall Tales is the earlier branding for the collection, while Rescue Squad Mater is the specific first episode title.