The problem isn't so much the fuel, it's the ancient piston aircraft (or at least, ancient engine designs) that are still kicking around.
There are modern piston aircraft engines that not only run fine on unleaded fuel [1], but are even certified to run on standard automotive fuel ("Mogas"). There are videos on YouTube of pilots landing on remote highways and pulling up to regular gas station pumps to refuel their aircraft!
There are modern piston aircraft engines that not only run fine on unleaded fuel [1], but are even certified to run on standard automotive fuel ("Mogas"). There are videos on YouTube of pilots landing on remote highways and pulling up to regular gas station pumps to refuel their aircraft!
[1] https://en.wikipedia.org/wiki/Rotax_912