Had my first experience yesterday of my Gen 4 not triggering the warm-up cycle on starting in the morning after parking overnight. This has never happened to me before on the Gen 3 or Gen 2. It's good because I have a 200 yard run before a long downhill commute to work in the morning; which means if I can time the traffic light approaches well I could potentially make my entire commute on electric only. I monitor using ScanGauge II and had always assumed the warm-up cycle trigger was based on engine temperature on starting (at least it seemed to be so on the Gen 3 and Gen 2). I wonder if on the Gen 4 there is another trigger related to the time passed after stopping. I was home late the night before and it was about 8 hours since I parked up. Coolant water temperature (cWT) on ScanGauge showed 23C (73F). Same values for the inverter coolant water temperature (ICT) and Boosting Converter temperature - upper (BUT) on starting. Battery State of Charge (SOC) was 48% (3 bars on display). I made it about 2 miles before getting caught at some traffic lights and had to accelerate away, triggering the ICE and the warm-up cycle. Another interesting comparison I have observed is that the first ICE shutdown after warm-up cycle takes place as low as 36C (97F) with some variability, which is noticeably less than on the Gen 3 and Gen 2 (which were both fixed and reliably happened at 40C / 104F). If you manage to keep avoiding ICE-on with slow accelerations the car seems to allow temperatures to fall away almost to external temperatures, which was not possible on the Gen 3 or 2. If you trigger ICE-on again, the shutdowns take place at successively higher temperatures. All my driving is in Eco Mode and with eco settings on all choices. I'd be interested to hear if anyone knows about the Gen 4 warm up cycles and how it is programmed differently from the Gen 3 and Gen 2.