An example of cold weather, highway driving, normal mode, climate set to auto, temp set at 67F, seat and steering wheel heat on, ACC/LKA on, car charged to 100% (165 miles predicted) and preconditioned for a 0815 departure in a heated garage (65F). Actual departure time 0825:
Outside temp 23F on departure, altitude 899', average speed 63mph, elevation climb 300', distance 55 miles. 2.02mi/kWh (49.5kWh/100miles).
Stopped to grab a snack at 55 miles exactly. Ended up taking a 7 minute break before continuing. Outside temp 19F, drove 53.3 miles with an average speed of 56mph, negligible change in elevation. 2.29mi/kWh (43.7kWh/100miles).
Arrived with 39% battery indicated after 108.3 miles. Plugged into a 50kWh CCS for 60 minutes using 43.7kWh, leaving the car at 91% charged (160 miles predicted). Outside temp 18F.
Drove 106.9 miles with an average speed of 61mph, elevation dropped 300', 1.95mi/kWh (51.3kWh/100miles). Arriving with 26% battery left (41 miles predicted).
It was not a windy day (for around here), wind speeds ~10mph out of the W/NW. But the only thing I can attribute the increase in consumption on the return trip is the light breeze which I was driving into.