Yes, it seems likely that it is to cram more charge in. We learned of it via the articles that viewtopic.php?f=31&t=21628 references. That might be responsible for a small part of the higher EPA range rating of the '13 to '15 24 kWh Leafs (84 miles at 100% instead of 73).
On the MY 11 and 12 cars a factor in the lower EPA rating was because for the test they had to show the 80% charge range result and not the 100% rate. With the 80% rate removed in 2013, then they could now list the higher range rate.
You got this completely wrong, making other info you provide suspect. The 80% charge limit (different from an 80% timer setting) was implemented
, the EPA lowered the range rating because of averaging in 2013
, and the 80% charge option, including 80% charge timer, was then removed in 2014
in the US. It was left in place in other countries.
2013 "Brilliant Silver" SV with Premium and no QC, a 2009 Vectrix VX-1 W/18 Leaf modules, and 3 EZIP E-bicycles.
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.