Actually, Dantrium, that mileage is fairly close to real. Today I travelled 101 kms (62 miles) and used 19.1 kWhs.
This equates to (84.4 divided by 19.1) = 418 kms or 276 miles. Currently the GOM shows 232 kms remaining and 76% charged.
The weather was ideal, 20C or 68 F with no wind. I was in ECO mode, preconditioned with climate off. I was driving at about 80-90 kms/hr enjoying the Fall colours.
However, I'm sure you're right when it comes to the cold - I'll revive this thread in a few months!