alozzy wrote: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.
Amherst, MA to Brattleboro, VT. Trip planner says:
Distance 41.7 miles
Driving Time 0:50
Charging Time 0:00
Total Trip Time 0:50
Total Energy Used 9.2 kWh
Average Efficiency 220 Wh/mile
Net Elevation Change -66 feet
As @Phatcat73 mentioned, there indeed was a tailwind out and headwind back, although obs say at only 5 MPH or less. But as I mentioned it was foggy and cooler on way home. Longer route, foggy, cooler, and wet road seem to be major influences.