You are correct-my mistake on which film was renamed. The Country town in the film is Clunes, the MFP garage is Melbourne University's underground carpark, MFP headquarters is now Scienceworks museum, The Roadhouse is still by the side of the road near Wallan etc etc

Actually the first movie "Mad Max" (retitled "The Road Warrior" for the US market) was filmed almost entirely in Victoria, about a thousand kilometers from Silverton.
Many of the locations are well known to me, some are just down the road.