Who produced an animated adventure film about racing that was released alongside a short film written and directed by Dave Mullins?
Lou (2017 film):  Written and directed by Dave Mullins, it was theatrically released alongside Pixar's "Cars 3" on June 16, 2017. Cars 3: Cars 3 is a 2017 American 3D computer-animated auto racing sports comedy adventure film produced by Pixar and released by Walt Disney Pictures.
Pixar