Hi,
I did that road in a Mini in May 2013. Road conditions varied according to how recently each section was graded. Most of the time (between head gaskets!) we managed 80-90kph over the corrugations. It was very dusty and barren but not rocky.
There are roadhouses every 300-400km approx where you can refuel and even stay overnight - Warakuna, Warburton and Tjukarila from memory. I can look up the locations if you need, but there is information online.
Cheers,
Brett.
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