I've noticed over the past week that my electric mileage has been getting better and better. I drive the same commute every day, which is exactly 12.0 miles going and 11.9 miles returning. For the first 900 or so miles of this commute, when I return home my battery miles remaining have been consistently 20, meaning I expended 30 miles of battery range to drive 24 miles. Over the past 5 or so commutes, however, my mileage has been getting better and better. This improvement is not only evidenced by returning home with up to 24 miles of battery range left, but also by the fact that my charger is requiring only 10.2 KWh instead of 11.8 KWh to recharge the battery.
Today, a new milestone: my 12.0-mile inbound commute consumed only 11 miles of battery range, leaving me with 39 miles of battery range remaining
I should note that my commute includes 4.0 miles of highway driving at > 65 mph.
What's causing the improvement? In order of my estimated likelihood:
- The weather has been cooler and this morning for the first time in recent memory the outside temperature never exceeded my cabin setting (73 deg F), so the A/C compressor remained off.
- My driving techniques to maximize range are steadily improving. I never use hill mode and generally minimize the use of the accelerator and brake.
- The ambient temperature (about 72-83 deg F) may be in the battery's sweet spot for optimal performance.
- As the battery "breaks in", it is accepting more charge. This seemingly unlikely hypothesis is supported by the fact that when I completely drain the battery, I now get more charge than I used to (now > 21 KWh; used to be about 19.5 KWh).
- Henrik Fisker is personally flying out to every Karma and charging our batteries while we are at work to increase the apparent range of his masterpiece.