I think you are right. While driving I don't think that would affect much as far as HV or causing ICE to start, but HV+ might be slower to charge, and regen might be limited because regen can generate a lot of current, those tenths of a mile tick up pretty fast even on a slight downhill.If I'm not mistaken, low temps can also affect an EVs ability to accept high charge rates. Lithiums don't like taking in energy quickly, when exceptionally cold. I'm betting it's only an issue on the Clarity PHEV (if at all) with L2 charging, and on the Clarity EV with DCFC.