I just took my LEAF to turtle in the interest of increasing the general knowledge base about pack capacity reduction and actual range impact.
My last (and first) turtle experience was on April 14, 2011, two weeks after bringing the car home, and before I had a Gid meter. Range from 100% charge to turtle was
86.5 miles at an indicated energy economy on the main dash of 4.0 mi/kWh. Turtle announcement came on about .3 miles before I stopped the car.
Today's readings are
75.0 miles range at 4.1 mi/kWh. Gid reading at the end of the run was 5 Gids (1.7%). Turtle indicator lit as I was pulling into the garage. Gid reading at the beginning of day was 258 (91.8%).
So I'm calculating a range reduction of 13.3%, minimum. Actual range reduction is probably very slightly more since today's mi/kWh was slightly higher and I stopped the car slightly sooner. Still, my 75 mile range is slightly better than the EPA rating for the LEAF.
Other data on my car:
Mieage: 14,372 mi
Age: Car delivered 3/30/11, slightly more than 15 months old.
I have not lost a capacity bar.
Most frequent charging percent: 100% until mid-May, 2012, when I changed to 80% charging most frequently.
Quick Charges: twice
Location: Coastal Southern Calif
Overall energy efficiency measured at wall: 3.22 mi/kWh, lifetime
I generally got a full 280 to 281 Gids at full charge until early May, 2012, when I started to notice a decline in Gids, as outlined up-thread.
Most recent three Gid readings at full charge were 257 (91.4%), 266 (94.6%) and 258 (91.8%).
Max capacity loss by Gid reading: 8.5%
Charging energy required to charge to 100% from turtle on April 14, 2011 measured by TED system: 26.1 kWh
I'll update this thread tomorrow with charging energy after recharging to 100%.
Update: full charge overnight went to 265 Gid (94.3%) and took 21.7 kWh from the wall.
So how do we measure capacity loss?
75 miles to turtle vs. 86.5 miles when the car was new? 13.3% capacity loss?
Averaging Gids to full charge? Mean of 263 Gid (includes most recent charge) on three consecutive days full charges vs 281 Gid: 6.4% capacity loss?
Energy from wall to recharge from turtle? 21.7 kWh vs 26.1 when new: 16.9% capacity loss?
I guess I'd go with the actual driving range figure.