I've gotten nice steady auto-CLI increases when charging and PIF'ing as little as 10-20% util monthly. I actually pay it off before the statement cuts (for obvious reasons), and they've bumped me 2-3x per year in those circumstances. Obviously, it's very much a YMMV situation, but since you asked.....

Edit: Wanted to add that was on cards in roughly the $10K range of CL.
Message Edited by TangMeister on
09-12-2008 02:36 PM