"Chris W" wrote in message ...
It is my understanding that the computers in cars use oxygen sensors in
the exhaust and not EGT to keep the mixture right. My question is why
not use oxygen sensors in airplanes? Is EGT easier to interpret when
it's a human instead of a computer controlling the mixture or is it just

You'd better stay away from 100LL then. The auto oxygen sensors will
be ruined by lead. The main reason is simplicity. No "computer" is
required. The EGT therocouble is about as simple as instrumentation
gets.