Another random thought; the whole point of the 350 mile rule has always been to make it easier for the verification teams to verify a ride. Believe me, when I had a 800km range it was sometimes irksome to stop just for a receipt.
So, my question would be to the Verification teams, have they had issues with the 600km distance in the past? I don't expect a public answer, but the thought here is that if they have had issues, knowing the nature of them may help everyone. I rather suspect they haven't had issues too often, as it's fairly easy to see if someone cut a corner or not, even with a 600 km distance between DBRs.
Not my first rodeo. We've all been there, get gas early so we can ride all night or risk no gas when you need it in the middle of the night, (or middle of no where).
You're coming from West Wyalong to Hay, then you had better stop in Goolgowi before 2000 to top off. Then it's only 523km to Pinnarroo. Don't pass known gas for unknown gas.
If you're heading to Adelaide from the northeast of NSW via the Hay Plane and you didn't top off at the Tasco in Gillenbah, yes, you're looking thin on options. But if you did top off in Gillenbah, it's only 446km to known fuel in Ouyen up to 2100, but 582km to Pinnaroo where it's 24 hour service. That passes the 350 mile rule, so you write a short explanation that no fuel was available when you passed through until Pinnaroo.
I still agree that the 600km rule makes more sense than the 563km rule, but it's easy to see why some would feel the 37km difference isn't such an issue.
From the SS1600km ride page:
We strongly caution that
out on the road it may not be possible to follow these guidelines to the letter. If that happens, please explain any problem you encountered and we will do our best to work out a solution. For example, 24 hours and 35 minutes into his ride, one rider could not find a gas station, eventually he found an ATM and got a receipt. While he was over the 24 hour time period, he had also ridden 1,081 miles, obviously he had ridden over 1,000 miles in 24 hours (no one can ride 81 miles in 35 minutes). In a case like this, we roll the map and clock back to the 24 hour point.