On the Eden Turtle? Wow, that's fast. I can only do him in 2:30-2:15.
(Have all accessories, now I'm grinding for gil to upgrade weapons)
Fang/Lighting/Vanille.
Fang: Kain's Lance Starred (Upgraded from Pandoran)/Genji/Kaiser/Power/Con Catalog
Lighting: Omega Weapon Starred (Upgraded from Axis)/Genji/Kaiser/Power/Col Catalog
Vanille: Belladonna, Level 53/Magistral/Gaia Ring/Imperial and something else
Out of 18 (recorded) kills of the Eden Turtle last night:
-6 Ingots (33% drop rate)
-1 Trap (I don't need these anymore, but I went ahead and equipped the Con Catalog anyways since it seems to help with Ingot drops (I killed ~15 turtles before I started recording stats and I didn't get a single drop of anything)).
-11 No-Drops
I love the Eden turtle since you don't even have to save/quit/restart. Just walk through the door to the complex and then come out again. Boom, new turtle. Plus if he doesn't drop anything, you can hit the guards up for chips.
I'm tempted to try this to up my ingot rate ((except it will make the Eden turtle take longer):
If you're looking for common drops, you want to try to game the system so that you get a 2-Star Rating or worse and keep a Collector's Catalog on.
Gil-scarcity is one of the worst things about this game. If there's an Int'l version I hope they let common enemies drop gil (not a lot, but a few hundred gil per mob would really let you experiment more with weapons and accessories. As it stands now, I really don't want to waste more time grinding gil to try different weapons).