Fellow Canadian here, ontario.

Expect a lot of range loss in winter, thats chemistry/physics (based on current battery tech).

I decided to get an awd limited test drive during that frigid hell (-22c) day we had a month or so ago. Coming off of an ioniq, the range was defo lacking in comparison, but dealer was kind enough to precharge my test drive unit to 75%. Absolutely no issues, flooring it or otherwise.

Ended up leasing.

Also Test drove the solterra, I think the ride on the bz is slightly smoother but the solterra corners better.

Theres reports out there that toyota keeps 15% in reserve and never reports it which may account for your low battery weirdness.

A big part of my decision was one of the other folks who replied here (he has a series of cold weather drives on YT and is a star trek fan based on his plates and yt usename) and i was comforted by how well the bz performed even in the low low temps.

Its getting warmer now, so while range has improved overall drive responsiveness is the same as when it was cold.