According to the "REGIONAL ECO RANKINGS" screen of the Nissan Connect EV&Services app, I got "Average Monthly 5.9 miles/kWh". I presume that's for the month of May. I guess that's as reported by the Leaf through the 3G TCU to Nissan's servers. Based on the dashboard display of mi/kWh, something over 5 is believable, although almost 6 seems a little optimistic.
2017-12-16 New Prius Prime
2018-02-21 Used pearl white 2015 LEAF SV Mfd 2014-07 In-service 2015-02-27
2018-02-21 26,938 mi AHr=60.22 SOH=96.98% Hx=90.73% 1 QC 988 L1/L2
2018-07-01 31,601 mi AHr=58.05 SOH=93.48% Hx=87.03% 11 QC 1223 L1/L2