Mator is voiced by "comedian" Larry the Cable Guy.
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In the animated movie Cars (2006), the voice of the character who says his name is "not Chuck" is Mike Nelson.
Michael Keaton
Michael Cine
Owen Wilson was the voice of Lightning McQueen, Bonnie Hunt was Sally, John Ratzenberger was Mack, Paul Newman was Doc Hudson, and you can see the rest at IMDB. I put a link to it below.
Cheech Marin did the voice for Ramone