Is Mad Max "Sci-Fi"?

It counts for the challenge because IMDb says so, but forget what they say. Dystopian movies aren't always sci-fi, are they? Presented as what-if fantasies, but that doesn't make them part of the 'fantasy' genre. All movies aren't real, but they can't all be labeled as fantasy.

What about Max Max neccessitates the label of "Science Fiction"? What is scientific about the movie? Society does not have technology at this point. What do you say, mate?