Personally, I found the AHr metric to be the most reliable means of determining how close I was getting to dropping the 9th bar. Mine finally went at 43.191 AHr (and Hx of 44.74 and SOH of 65), so if you're already down to 41.70 AHr, I'd think you should be losing your 9th bar any day now. Good luck and hopefully you're under the 60,000 mile cutoff...
Ocean Blue SL-e
Per LEAF Spy as of 03/16/17: 12 bars, 238 GIDs, 56.3 AHr on new (04/30/15) Lizard battery
Orig. battery lost 4th bar at 177 GIDs, 43.19 AHr, 44.74 Hx, 65% SOH after 45 months