Thanks for the cold weather range testing.
I'm running the Pirelli winter tires. I just did a second road trip, with similar results to the first one. The temperature was not quite as cold this time, and the pack was also warmer when I first set out. I'm really thinking the range difference is mainly due to the winter tires, not the temperature.
On both trips the VDS reported higher-than-normal power consumption at first - 200 Wh/km versus 170 Wh/km after the No-Regen light went out. I was maintaining the exact same speed. Is this a Range mode thing? I must confess that on previous road trips I've not looked closely at the power consumption early on.
About the heat: someone found that blocking the passenger vent greatly increased the driver's comfort, without affecting the passenger noticeably. Should translate into lower power drain.
Hmm, does turning the heat down save electricity? ... or do you really need to shut the heat off completely?
With an ICE vehicle, the knob controls the rate of flow of engine coolant, which is vastly different from what is happening in an EV. The Roadster is using 400 V for the heater, but does it throttle the current or pulse-width modulate it when you turn down the cold/hot knob below full? Would the heater use any power at all if turned on with the knob rotated fully counter-clockwise?
Also note the maximum amount of heat it will provide depends on the fan setting. (I recently noticed that one of the firmware upgrades appears to have changed this behavior somewhat, but I haven't explored that yet.)
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