Fair, but my hybrid (not plugin) gets about the same efficiency regardless of outdoor temperature, it's usually around 45-50 mpg. While pure combustion engines likely won't improve, hybrid systems can absolutely thread that needle really well and are a great option if you need range in the winter.

We currently have a hybrid and a pure ICE car, and we're planning on replacing them with an EV and a hybrid. I'm not giving up my hybrid until EVs can go >500 miles on a single charge, because we regularly go on road trips of >800 miles in a single day, and EV charging infra is pretty spotty in those areas.