A bit more serious though, it is not really possible lore wise. The ocean in Fallout is super duper inhospitable. While Tenpenny claims to be from England, the ferryman from Point Lookout reminds us that the seas are full of waterspouts and sea monsters that make deathclaws look like molerats. And Mad Max is in Australia. The only way a crossover might happen would be if somebody made a super souped up virtabird to fly across, and even then, the weather would make that unlikely.

However, Fallout is loaded with Mad Max references. While making Fallout 2 (might have been 1, but I think it was 2) they had Mad Max on loop in the background for inspiration. It is to the point where I personally say the two are in the same universe, at least, on the Fallout side. As in, in Fallout, Max Max is going on concurrently. In Mad Max, nobody cares about America, so who knows.

The Shoddycast made a video about this, called Hidden History: Fallout = Mad Max where they show a number of Max Max and references in Fallout.

Side note, why do you like the Mad Max game? I have been getting conflicting messages from critics and other players. As a huge Fallout fan, would I like this game? I'm probably going to wait for TB to release his "WTF is...?" on it, but more input is never bad.

There's an homage in-game, at least.