Who needs the added risk and worry of running a tank dry? There is
always a small chance that an engine will not start if you allow it to
actually be fuel starved. I don't recommend doing engine outs by
pulling the mixture knob either. But people do it and usually get away
with it. I wouldn't recommend it. Airlines ops don't allow it, for good
reasons. You simply don't want the added risk, stress and decision
making. I want to keep my engine running!