FAA is the problem. They are extremely slow.

> On September 1st, the Federal Aviation Administration approved the first unleaded fuel found fit to power every spark-ignition engine on every airframe in the general aviation fleet

This fuel has been around for much, much, much longer. And yes, this is September 1st 2022.

Transport Canada is worse. Getting insured on certain makes and models (which are commercially available) is such a challenge that it takes less time to learn to fly acrobatic planes (not exaggerating).