Comment by tass

Leaded is slowly going away, but regulation means these changes take many, many years and dollars to implement and test.

It will be similar (worse?) implementing a new type of fuel for commercial jets, especially when it comes to wide adoption across a majority of countries around the world. Basically you need something which is as least as reliable, clean (I.e., won’t clog/solidify), non corrosive, etc. and remain that way after being mixed with standard jet fuel.

I too want to see alternatives but expect to see more failures than success at this stage.