For those who use dilithium:- what do you mostly use it for?

Gogus

Cadet missions refills (state which ones in comments)

I mainly use them for extra tickets for cadet missions:

Specifically shuttle boosts (Thursday)
Credits (Saturday)
Sometimes Chrons (M, W, Fri.)

But I also recognize this may change as I get more of my crew higher level.

Hungry Dog DDM

Event packs 650/72dil per time

Mostly Event packs - If I don't have one of the characters FF/FE already.
Gauntlet revives - Only once, I was so close to 1st in the last minute that I just couldn't let it go.
Theme packs 6500/650 - Occasionally, if I don't have any of the characters FF/FE already and it's a card I really like.
Shuttle missions - Never
Cadet missions refills - Never
Arena battle refills - Never
Voyages - antimatter refills occasionally, although I'm going to save the next few months and go for a 72 hour run.
Dabo - My rule is that if I have the 5* being offered and it isn't FF I will give it a 10 dil pull. But otherwise, no.
Faction stores - Only once. It was a real beast of an item and I just wanted to get the person out of my crew.
Other - Shuttle boosts once or twice.

[Retired] BeamMeUpScottie

Voyages (antimatter refills and speeding up recalls)

I use it mainly for AM refills because I forget to recall or miss to recall due to real life activity and work