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The 1.7 notes are preconditioning are vague:

  • Smarter pre-conditioning timers: The battery will be pre-conditioned prior to departure in order to increase range.
I personally think if you charge to 70% and set timer for precondition, it only preheats cabin, not the battery. I think to precondition the battery it needs to be 90% and plugged in. I have done this several times and it's very noticeable that the car is much more efficient kwh/ 100 then if the car was cold.
 
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