I've been following aviation for the last 20 years and have seen particularly since the last 10 a lot of talk of aero-diesel engines for light aircraft. The idea being they're cheaper to run using Avtur rather than expensive Avgas.
I'm surprised that in 10 years since I first really saw this mentioned not much has changed. There are a few new aircraft available and retrofits, but by and large engines are still traditional in new aircraft.
Is it likely that aero-diesels will replace traditional aircraft engines any time soon?