What were your start and end points? Check out https://www.evtripplanner.com/planner/2-8/
to see what the elevation change is between end points. Also, if you select the "LEAF Beta" profile it will show the estimated kWh energy usage for both legs (to reverse the direction, use the double arrows just to the right of the "Route thru Superchargers" button)
Assuming 20 kWh of useable pack energy, here's the efficiency estimates:
43% on way out, or 8.6 kWh, over 50 miles - roughly 5.8 miles per kWh
58% on way back, or 11.6 kWh over 55 miles - roughly 4.7 miles per kWh
Your efficiency on the "way out" was really good. Less so on the return trip, but still decent.
I would guess there's a net elevation difference between end points. But, perhaps it was colder on the way home? Colder air is more dense, so more air drag, especially at highway speeds. Could have also been windy.
Vancouver, CA owner of a 2013 Ocean Blue SV + QC, purchased 01/2017 in WA
Zencar 12/20/24/30A L1/L2 portable EVSE
1-1/4" Curt #11396 hitch
After market, DIY LED DRLs
LeafSpy Pro + Konnwei KW902 ELM327 BT OBDII dongle
Loving my first BEV