Road Report
Just back from a quick run out to Quilpie.(2300km + work in < 2 days) On the way out I went from St George to Cunnamulla, then to Quilpie, (Directions available if required) Tar road, single lane for a portion, and a nice drive. The road is in excellent condition at the moment. I actually had better phone coverage than the main road this way, but it is still limited. This is my preferred way to get to Quilpie.
Came back from Quilpie via Charleville and via Bolon Rd back to St George. Its about 180k's of dirt that is about 7 lanes wide (I kid you not, you could line up all the navaras that were at the muster across it). Its in reasonable condition, with limited soft or corrugated sections. I did this at night, and whilst there was a massive amount of wildlife, actually achieved a reasonable time. It is quicker to go either via the road above, or via Mitchell (you can go direct from Mitchell to St George without going through Roma)
The road from St George to Moree (via Mungindi) is in fairly good nick at the moment.
I've never driven the Quilpie to Birdsville road, so can't offer much help on that one.
FYI, I typically get fuel at St George and Quilpie from the Mobil Depot, They have 24hr eftpos so you can just throw your card in the machine, and fill up, and as a lot of trucks fill up there, it turns over the diesel..(No old stale crap fuel) I was talking to a Nissan mechanic from Charleville last night, and he said they get heaps of Navaras in with fuel contamination.