Plans change, and I am surprised I ended in Mount Surprise. Tours to the lava tubes only run out of Mount Surprise, so I put my foot on the accelerator and was blown by a tailwind downhill to Mount Surprise.
It was slow going in the overcast weather, undulating landscape and headwind to Mount Garnet and then Pinnarendi Station.
New information. I don’t want to cycle to Einasleigh due to horrible corrigations. I do want to go to Mount Surprise tonight so I can join a tour to the lava tubes tomorrow morning. This required a speedy 71km which I did in under 3 hours. Thank you tailwind (after the road changed direction) and gradual downhill slope.
arctic-cycler.com 
That’s the great thing about cycle touring! Changing one’s mind at the last moment (for better or worse).