"Uli" wrote

FADEC is much more than just controlling mixture. that system is
measuring,
monitoring and governing a whole lot of parameters. compared to a human
operating a few levers, FADEC can set all these parameters in a way so the
engine/propeller-combination operates much closer to its optimum.

also, today's engines can only be that economic because of the electronic
system. as an example, fuel injection varies in injection time and the
amount of fuel injected, depending on RPMs, power setting, flow of the
mass
of air through the manifold (not just the air pressure in there) and
probably a few more. you cannot achieve this by mechanical or even maunual
solutions.

Of course it does much more, but the mixture is a big part of the equation.
One thing you missed mentioning is the timing, on some systems.
--
Jim in NC