In general, I have not been fastidious about data collection like some folks here. However, it's probably worth a quick update to share where our LEAF's battery capacity stands after three years and 47K miles of driving, the majority in SoCal's San Bernardino Mountains.When we first picked up our LEAF from Fontana Nissan in 2011
, with a full charge, we had to take the longer route home via CA-18 because CA-330 was closed at the time. The drive was at least seven miles longer the way we took, with more elevation changes. We arrived home with "three bars" of charge, which went up to "four bars" after 1.5 hours of trickle charging.
Last night we also left Fontana Nissan with a full charge from their AV L2 charging docks and six battery temperature bars. In fairness, the battery pack was probably a bit out of balance, as our GID meter reported "77.2%" when the charge stopped. We took the most direct route home, using the 210 freeway and CA-330, 31.6 miles in total. We kept our freeway speed to 55 mph and ascended the mountain at about 35 mph (with a few turnouts to let other vehicles pass). We reached home with "14.5%" indicated on the GID meter, which immediately dropped to "13.8%" when we plugged the car in. This was probably slightly lower because of intermittent cross-winds on the drive, but not very different from other, recent drives home after charging at Fontana Nissan.
The bottom line is that if we were to replicate the original, longer drive home done on 4/20/2011, we'd be risking running out of charge. That's a far cry from making it home with "3 bars" of charge, somewhere above "30%" in GIDs. If anything, I suspect our current capacity loss (judging by GIDs at "80%" charge) is somewhat understated.
It's also worth mentioning that I commuted to an employer down in Redlands for nearly two years using the LEAF (well, mostly, as I often biked part of the commute). The battery pack's average temperature was certainly warmer than if all of those miles had been at elevation.