Avgas without lead or ethanol was supposed to be ready by 2018 from Swift Fuels and Shell. These are the only two that passed all the FAA tests.
Several years back I bought a used Rotax from a friend. It was loaded with lead deposits on the top of the piston and even in the exhaust system from running avgas100LL.
At this time, mogas just had MTBE instead of ethanol. I started running this fuel and within 3 tankfuls, all the lead was gone and the piston and exhaust were clean.
You can thank Archer Danials Midland for ethanol in your gas and high fructose corn syrup in your food. All it took was some lobbying ($$$$) of the farm belt representatives.
I could go on...
John M