Originally Posted by
Locked door
It’s almost always worth SETO unless you’re constrained by engine warm up time, and as previous posters have pointed out if you practice it it’s not difficult.
I often start the second engine almost immediately after commencing taxi if it’s a short taxi. That reduces eng 1 run time as you’re moving during eng 2 start (assuming no atc delay prior to departure) and saves a small amount of fuel. Over a career that will be a very large amount of fuel saved.
LD
With the long NEO (LEAP) engine start times I almost always start engine number two during taxi. This way, in addition to the fuel savings, I don’t waste time motoring the second engine whilst stationary going nowhere in front of the gate.
Even on smaller airports with a single taxiway and short taxi times this is worth the effort because otherwise you would be blocking the taxiway anyway. Might as well keep things moving.