Thats true, but aircraft engines also run harder, must be lighter, and more reliable. It has been discussed elsewhere, and is a technically harder problem.

On top of that, general aviation makes up a much smaller part of the population motoring around every day, so probably less of a priority to gain political traction (until now).

That being said, I’m very happy to see an unleaded standard. It was my understanding that 100LL was not able to be transported via pipeline, which was part of the contribution to its higher cost.