This made me LOL — as clearly you have never owned a vehicle with a high voltage battery before.
Having owned 85 vehicles, 20+ of which were PHEV/BEV, including: 12 Tesla vehicles (one of each including a Roadster), 3 BMW i8 PHEV, 1 BMW i3 PHEV, 1 Audi A3 eTron PHEV, and a bunch of other BEV (Chevy Bolt, Audi eTron SUV, etc) — i can assure you that one DOES lose quite a bit of range.
Overall, during the sub freezing days/months of the year, you can see as much as 35-40% loss of energy. This is quite normal, its just physics and how batteries work. You should expect to see that 25 mile EPA range Drop to around 15 miles during those days. You can mitigate this a bit on some cars by preheating the cabin on “shore power” (while plugged in) but the fact of the matter is once underway, the range impact will still occur — so this may save a mile at best.
Where I live, we can often go 2+ months with temps never getting above 30 F … it is that window where range will be at its worst. Of course, this is based on other factors still like driving style, tire choice, etc. But for those who might read this, do expect this to be the case. For days in the 25-45F range, I’d expect 20 miles are still feasible — but for the 0F to 25F days (we get -25F wind chills here in NE Ohio along hte Great Lakes) — 15 miles seems quite likely.
I’ll be sure to report back in Jan/Feb.