Newly registered but reading for quite a while, I want to say that I have learned a lot from these fuel consumption exploratory and explanatory threads Trex started of. Many thanks for that!
I'm driving my PHEV since March 2020. Meanwhile, I know my regular road ways quite well and can end up routes with an empty SOC reaching garage doors. As we live in lower hills, I have also made experiences on SOC behaviour on climbs and Regen on downs.
Especially on mid length routes where it requires considering the ICU supporting the SOC capacity, I can confirm the fuel numbers reported here at somewhere around 7.2 l/100km and less. Long term data shows that I'm effectively driving 50:50 electric vs. fuel over all. Average fuel consumption in the display shows about 3.5 l/100km. The number I can't believe really. What I can say is that a frequent mixed route of about 90 km ends up at under 6 l/100km in winter times and even below 5l in summer if I recall correctly. Cost logs show that electric driving last year was about half the cost of fuel.
So what am I doing to achieve this? I'm kind of orchestrating Save, Charge, Sport, EV and normal modes. When it became cold late autumn, I began to start with the Sport mode on 4WD to have the engine run and support the heating right from the beginning whilst consuming energy from the SOC. After a while switch to EV mode to prevent serial mode in villages. Out of villages, either use Sport again or switch to Safe or Charge for parallel mode. The latter depends on the strategy of either keeping the SOC level or accumulate to bridge upcoming serial mode distances. All with the focus of ending up with an empty SOC at door steps.
After playing with the B modes at the beginning, I ended up driving B0 most of the time and flexibly use Regen on a finger tip where required. B0 is just relaxing for foot and leg.
This might look like quite a job and hassle. Being used of driving hand geared cars for centuries, its rather fun experimenting while it developed a lot of routine over months. So, I'm not thinking a lot about it really.