Boffingham, too bad about that 2017...
First, the Range Remaining (RR) indicator prediction is based on how the car was driven for the preceding 15 miles (24km), and can thus vary all over the map. Sitting at a dealership I would expect this RR to be somewhat on the low side as most people like to leadfoot the car during a test drive. Turning on the heater decrements that RR approximately by 20% and turning on the aircon decrements the RR by around 10%.
In winter, preconditioning the car for about 15 minutes using the Remote (make sure the car has the Remote) is soooo nice, as you can either heat the car or both heat and defrost it as well. Yes, it works using 120vac but not as well as using Level 2 (240vac). Perhaps some of our northern friends can comment on this.
The heater in the i-MiEV is rather wimpy for very cold-weather climates. A number of owners have successfully inserted a diesel heater into the existing plumbing (there are a number of threads for this mod on this forum) - this mod makes a very big difference in winter comfort. That said, if you're just using the car for short errands, pre-heating it and running the heater + seat heater should work just fine as you don't care about losing range.
Come winter, most of us (even here in California) turn on the seat heater, as it consumes very little power compared to the main heater.
If the 2012 has CHAdeMO or the cold weather package then the cabin heat *I think* is automatically routed down to the battery, in addition to the aircon automatically turning on to cool the battery when using CHAdeMO. I'm a bit unclear on this, so perhaps someone can elaborate.
DCFC (dc fast charge) CHAdeMO is very highly desirable as it dramatically extends the usable range of our little i-MiEVs.
Oh, and don't forget to have the dealer give you a battery condition report. Edit: This 2012 car probably has the original LEV-50 cells and not the upgraded LEV-50N. Remember, the car's 10-year battery warranty will run out within the year, and there still is no one (that I'm aware of) in North America providing battery refurbishment, as buying a new main battery from Mitsubishi I believe is still cost-prohibitive.
EVs: Two '12 Wht/Blu SE Prem., '13 TeslaMS85, three 156v CorbinSparrowsLi(NMC), 24v EcoScoot(LiFePO4)
EV Conv: 156v '86 Ram PU, 144v '65 Saab96
Hybrids: 48v1kW bike
RIP(2021) ICE: Orig.Owner '67 Saab96V4, '88 IsuzuTrooper; '76 MBZ L206D RHD RV