FGC at it's best, the A3 e-tron cannot operate below -28C..
So, a little update from the cold weather no EV (-10C) issue;
Norwegian importer now confirms that EV mode is not available below -10C. Apparently this is because while the battery is cooled in the summer, it has no heating possibilities at all. This is unlike other PHEVs, and BEVs, that have both.
Even worse, it is also confirmed that at -28C or below, the car cannot start at all! This is because the ICE use the EV as a "starter", and at -28C the high voltage (EV) battery can no longer operate.
I Norway we do occasionally (in rare conditions) experience below -28C, like in the mountains when we go skiing, or further north.
https://speakev.com/threads/a3-e-tron-owners-experiences-and-complaints.7732/page-7#post-227575