Sure, and any petrol engine can run on 78 RON fuel to. It's just that if you try to run it at full power you'll blow it up. Wee bit of a problem on takeoff.

Same thing with running certain large piston airplane engines on 100. They blow up.

> There are several options that involve no lead, generally substituting with ethanol

Ethanol is corrosive to aluminum. Thankfully airplane designers have never used aluminum in airplanes...

We can't use ethanol because of phase separation amongst other reasons but this is true considering we've been using stuff like toluene probably even longer than tel.