The franchise creator tells Top Gear that the 30 year development of Fury Road left him with at least two films worth of unused material that he doesn't plan to let go to waste.
"This film [Fury Road] was green lit three times and fell over three times over a decade," Miller said. "We went to shoot with Mel Gibson back in 2001, but then 9/11 happened, and the American dollar collapsed against the Australian dollar close to 30 per cent, so we lost that amount of budget overnight.
"We were then rained out of Australia. The desert rained for the first time in 15 years, and we ended up in South West Africa, Namibia. But in this process, we had dug down deep into the backstory, not only of the characters, but of every vehicle. How the steering wheels became religious artefacts and things like that.
"So we ended up with two scripts, without really trying. We're talking to the studio [Warner Bros] about it as we speak, but which one of the two stories will happen next, I'm not so sure."
While the wait will hopefully be shorter than the 30 years between Beyond Thunderdome and Fury Road, Miller did say he'd like a bit of a breather before returning to the Wasteland.
"I want to do a small film without special effects before I do any of that, just to do it quickly," he said. "We shot Fury Road for eight months… that's a lot. Every day in the heat and the dust, doing these stunts, it's very wearing. We've got two more planned, but at some point in the future."
Miller had previously said the next film in the series would be titled Mad Max: The Wasteland, but it's unclear which script he was referring to then, or if the name will stick should they decide to go with the other script first. Star Tom Hardy has stated that he's signed on for three more Mad Max movies, so expect to see him reprising his role as Max Rockatasnky in the next film, no matter which script gets the go ahead next.