My 2013 Leaf SV lost 1 bar (currently at 11/12) at about 27.5k miles. That seems kind of early based on what I've read here. The car started out in Livermore, California for 3 years and now in Vancouver, Canada where the weather is a lot milder but damp.
I don't know what charging method was used during the first 3 years, I am using trickle charge at home and Level 2 when I need a top up. After a full charge, the Leaf reports about 78 miles of available range. I believe the manufacture date is May 2013. I don't have Leaf Spy stats yet but working on getting some soon to post.