I have a 2012 SL. Currently at 47,000 miles I use it every weekday to commute to work 18.6 miles each way. With the occasional lunch trip and seeing some customers and vendors within 10 miles....average 40 miles/day just 1 occupant. That's all surface roads with traffic control every 1/3 of a mile taking 45-55 minutes. Weekends - local shopping 2ppl.
Total about 1,000/month.
Battery degradation- Full charge is now only 88% ( I have a Leaf-DD readout connected)
Car is garaged - rarely below 30F
Yearly average usage 4.1 miles/Kw-h
Warm weather use is fine without additional charging. I average over 5.3 miles/Kw-h
Below 45 degrees I will charge at work to 80%. Weather like we have just had (teens) my range is a mere 35-45 miles at 80% charge (2.7-3.2 miles/Kw h with snow tires). Yeah that 2012 heater really sucks up the electrons! I occasionally use more Kw-h for heat than for propulsion. I braved it during the polar vortex and drove it to work when it was -13F. I did need to Bundle up, the heater cannot keep up with those temps. Battery pack heater came on for a few hours.
The battery capacity also drops as the battery gets colder.Frequency and length of charging and discharging, i.e driving, which heat the pack effect the battery temperature. Estimated that at 25F there is a loss of 2.4 Kw-h from a fully charged battery.
There are some apps like LEAF NRG that let you put in battery temp., mileage on the vehicle, air temp, elevation etc. and estimate the available power and usage for a trip.
OK I have rambled on enough........ Good luck, George