[gbtw]

Also avgas still mostly has lead in it: https://en.wikipedia.org/wiki/Avgas

[jabl]

Just a couple of days ago we discussed the first approved 100 octane unleaded avgas. One hopes this can scale up quickly and replace the leaded 100LL.

https://news.ycombinator.com/item?id=27983845

[kube-system]

With as conservative as aviation is, and as long as airplanes last, I doubt anything about it will be quick. I’m amazed it has taken this long to get a single approved 100LL replacement, considering high octane unleaded fuels have existed for decades.