Heat Pump- 5% Climate Energy Use at 12F-17F.

I made a 230 mile trip at 70 MPH in this recent cold weather. Heat pump set to 67F with fan speed at 2 or 3. Seat(s) and steering wheel heater on. Full cabin climate setting for 1/2 of the trip with one passenger and driver only setting for 2nd half. Outdoor temps. ranged from 12F- 17F. This 5% energy use equates to app. 1.1 kW continuous power during the trip, which is quite good. Previously, at 25F, I noticed 3% climate energy use during long distance travel with the same settings. Anyone with data for colder outdoor temps. during a long trip?