Same way you did... miles / kWh. But I have less miles than you, that's why I said "preliminary."
I just did a search and found the MYSR can get up to 4.0, the MYLR up to 3.8 - both IF you do everything possible to maximize (I haven't, e.g. I've had sentry mode on parked away from home at all times).
Oh, okay - the reason I asked is because if one takes the kWh figure reported in the
vehicle (which is lower than the one reported in the
app which is lower still than the
actual amount of power being metered and purchased to charge the vehicle), the vehicle will
appear to be more efficient than it really is.
For example, my
vehicle reports 3,269 kWh used over 12,174 miles - that's 3.72 mi/kWh.
The
app reports 3,762 kWh used over 12,174 miles - that's 3.24 mi/kWh.
The
Wall Connector reports even higher usage. For example, the app shows 20 kWh on December 14, but the Wall Connector measured 21.2 kWh. On October 26, the apps shows 23 kWh, but the Wall Connector measured 25 kWh. This about 7% higher than what the app reports, which would be about 4,042 kWh - that's 3.01 mi/kWh. See how these efficiency numbers keep dwindling as the accuracy of the information improves?
Lastly, even the figure reported by the Wall Connector doesn't account for the losses between the metering point and the Wall Connector itself. For me, that loss should be minimal since there is only a few feet of wire between my meter and the Wall Connector, but can be very high. There's a NEMA 14-50 receptacle at a local park that I charge at that is a few hundred feet from the meter. At 40 amps, the voltage drops from 240 to 220 - that's
another 8% loss (800 watts being lost as heat in the wiring between the metering point and my vehicle). Even though the electricity company is billing for that 800 watts, it isn't going into my vehicle. So, the
real efficiency is closer to 2.76 mi/kWh when you account for all the losses.
To recap:
3.72 mi/kWh based on the vehicle
3.24 mi/kWh based on the app
3.01 mi/kWh based on the Wall Connector
2.76 mi/kWh based on the actual amount of power metered by the electricity provider