[andrewg]

JetA-burning piston aircraft exist - almost all Diamonds for instance.

[nmhancoc]

General aviation is a pretty small market. I doubt the development costs can be justified. For reference Lycoming only switched away from carburetors around 2009, plus there’s the installed base of old engines being serviced.

I do think some European engines have looked at diesel though

[mschuster91]

> I doubt the development costs can be justified.

There is no other reasonable choice. Lead fuel has to go away simply because of the amount of lead that deposits all around GA airports.