Not referring to you. Just wondering why he never returned
Possible troll
I'll throw in my 2 bar worth.
I use EAN40 as my second gas in the region where I dive as it gives me a longer bottom time.
My first dive is usually 30m dive on EAN34 and the second dives are anything between 20-24m where using EAN40 gives me a longer second dive than using the same first gas. For my buddy and myself this means longer on the dive site with no disturbance from other divers who are generally on air.