The Best way to know for sure would be to ask the dealer to allow a weekend lend of the car. Our let us use the car over two times for a total of 8 days usage.
When you get the car on loan, regardless of the weather, hop in the car and plan a route that keeps you near home so you can pull out of the testing at any point and make it home on 10 km range, plus you have the with heater, aircon and seat heater off, another 7 km on the turtle, which lets you drive at about 70 Km / Hr, I know, I did it ! Yes the Headlights and radio still go when on Turtle mode.
So Route Planed, say around several blocks at slow speeds or a known easy route with highway speeds, do the following:
Wear clothes that will allow you to not be too hot.
Turn on the Heated Seats, Turn on the Aircon for demisting on Max to get worst range, in practice we find Medium to be heaps, Turn on Heater to Max to get the Heater to work at full power, open the windows as needed to keep the car at a reasonable and comfortable temperture, turn on lights, radio, and GPS, Have four people on board or take only as many as you would expect to be in the car normally.
Now drive, as hard as you like, within the legal limits of course, watch out for people who may not hear you driving slowly if in a low speed area too.
With every thing on, At 117 Km / Hr or 70 Mph, you should get 50 Kms Range, driving hard.
So what if you are say stuck in traffic, heater and everything on, not moving, then the battery will last about 1.75 hours.
So say you left everything on max, went 10 km at 117 Km / hour sat in traffic not moving for 30 minutes, then late for work travelled at 70 Mph, you would have :
16 Kw to start with, less 10 km @ 117 KM / Hr using Approx 180 watts x 10 or 1.8 Kw for the motor, and during the 10 Kms, 180 watts per min x 5.1 min for the Heater and aircon, say 250 per min for everything not counting the motor, so 1,275 watts for the 10 km or 5.1 min trip. 1. 8 Kw and 1.275 Kw = 3.075 Kw .
Then sitting in Traffic for 30 minutes, no motor power used, but heater and aircon and heated seats and lights etc, on for 30 minutes. : 250 x 30 =7, 500 watts or 7.5 Kw
So far we started with 16 Kw, used 3.075 Kw so had about 13 Kw left, then used 7.5 Kw so had about 5.5 Kw left.
At 100 Km / hour for 10 minutes and then stuck in traffic for 30 minutes we have used a total of 10.575 Kw, and travelled 17 km out of a trip expected to be 70 Km round trip.
This gives a round trip left to go distance of 53 Km. To travel 53 Km at around 117 Km / Hr takes about 28 minutes.
28 Minutes say 30 minutes, x 250 watts for heating and aircon etc, not motor, = 7.5 Kw plus 53 Km x 180 watts per km = 9, 540 watts. total for 70 km trip plus 30 mins stuck in traffic, 10.575 Kw + 7.5 Kw + 9.540 Kw = 27.615 Kw
Now we can see that this is not a practical trip at that speed with everything on as the battery only has 16 Kw available and the usage would be 27. 7 Kw or so.
In practice, if you had the Heater on for that long on Max, it would get really hot in the car.
If say the trip was no delays, at 117 Km/ Hr everything on for the moving part of the trip only, then the usage would be 27. 7 Kw - 7.5 Kw = 20.2 Kw which is also not achievable.
Looking at it another way, the travel with no aircon or heating or heated seats uses abut 12. 7 Kw for the 70 km trip.
That leaves about 3.3 Kw spare.
If you put the heater on max, no aircon or heated seats, it would use about 5.5 Kw per hour, or about 92 Watts per minute.
The 70 km trip would take about 37 minutes. During that time the heater would use about 92 x 37 = 3.4 Kw. Would work.
If you turned off the heater say a few minutes before arriving at work and a few minutes before getting home, you would have plenty of range.
Or perhaps better, if you used the heater on Medium, then you would have heaps of range.
We had the car going for 50 Km with the heater on Medium, at about 90 Km / Hour and for about 45 minutes and used about 12 Kw.
So in conclusion, the 70 Km trip, at 70 Mph and everything on max, no, not doable.
The 70 Km Trip with Heater on medium all the way and a bit of aircon for a few minutes to defog the screen at the start of both trips, and then at 70 Mph, yes can do.
If stuck in traffic though, one would have to turn the heater to low, or on the highway, go slower, say 100 Km / hr.
It is a tough one, I favour adding an inverter, a couple of Gel batteries and a 110 V 0r 240 volt fan heater, that way the imiev main battery would not be used for heating and the range would be about 100 Km.