Lycoming FADEC
A FADEC is on the way from Lycoming, I would guess that they could reduce the fuel burn by 25-30%, (after all you can see a 20% reduction in fuel burn by fitting a LASOR ignition system).
Lycoming are of the opinion that the problems that require Deisel engines to have dampers fitted are outweighed by the advantages of a MOGAS burning FADEC controled engine.
At the moment I have yet to be convinced of the advantages of the diesel as an aircraft power plant, may be when I do the Thielert course next year I will adjust my opinion.