I think you're right, Mike; every time I've done two charge/discharge cycles per day for a week my stats have improved, but a week or so later I see signs of degradation. Did I do enough driving over Christmas? We'll see. At least the battery seems to be responding again. It has been stuck at 183 GIDs for about three months.
I get about 40 miles if I drive at the speed limit in the mountains now, and it takes about 4 hours to recharge. 14 kWhr storage, at 3.3 kW recharge rate... so I can comfortably do two discharges per day. Three would probably require night driving, which I hate doing when I'm running the car down to empty. I haven't gotten stuck on the highway yet, and don't want it to happen when it's dark and cold out. I do manage to scare myself two or three times a week. There have been several recent "heat off, keep it at 35 mph" limps home on the 55 mph highway. I now have more than enough experience driving in turtle mode. You can get the lowest cell pairs down to about 2.972 Volts before the contactor opens...
Gotta look at economics, also. I could have taken a week or two off just to drive the car, but the lost wages would have just about paid for a new battery. In order to exercise the car over Christmas, I trailered the car the 56 miles to Lake Isabella. I still regret that I didn't do the same over the 4th of July and Labor Day. Based on Ahr readings back then, I didn't see the need.
-Karl