Did a run from N.Pembs to Swansea and back on Friday, swinging into Kwik Fit Carmarthen to have yet another puncture sorted on the way back! Mixture of A/B roads and DC, usual 60-65 on DC and averaged 3.7 m/kWh over the whole 100m round trip, never got above 6 degrees.
The eC4 does seem to handle cold weather quite well, having the heat exchanger definitely helps.