[systemBuilder]

Nissan accidentally leaked their battery cost for the Leaf, $140/kwh. But they don't do cooling so their batteries die twice as fast as they have to ... Panasonic was livid about this ...

[iknowstuff]

Googling this brought me back to this comment. Do you have a source for this please?

[spenrose]

Our 2015 model year Leaf has not had any observable loss of range, FWIW.

[m463]

Apparently they had a reformulated chemistry, that might help.

However, I think the climate you live in has a profound effect:

http://www.electricvehiclewiki.com/wiki/battery-capacity-los...

scroll down to the battery aging table depending on location.

If you live in Juneau, Alaska you're probably good for a while.

Maybe taking steps like not charging to 100% and not discharging below 20% will help.