[Piwoslaw]

I did the test today. It was around 0°C (32°F) this morning when I started, light drizzle. I idled for 30 seconds every 15 minutes, recording the coolant temperature on the ScanGauge when starting and when stopping the engine. I noticed that right after starting the engine the 'old' (when the engine was previously stopped) temperature showed for 5-10s before it was updated. I also recorded the total energy used by the heater.

During the test the grilles were blocked, but I removed my thermal insulation. I replaced it after 2:30h, so the last 30 minutes of the test were with the insulation.

time	coolant temperature - start (°C)	coolant temperature - 30s later (°C)	total energy used (kWh)
0:00	1	1	0.00
0:15	1	9	0.15
0:30	10	17	0.27
0:45	18	23	0.40
1:00	23	27	0.54
1:15	25	31	0.67
1:30	28	33	0.81
1:45	31	35	0.93
2:00	33	37	1.07
2:15	35	39	1.20
2:30	36	40	1.33
2:45	38	42	1.49
3:00	39	42	1.60