My average is consistently around 45mpg, that is with mainly motorway driving during the week.
Bear in mind my boot is full of work equipment adding a lot of weight at all times, without that I would get over 50 easily.
How the car manages the mileage I am not entirely sure, the electric motor seems to work best at complimenting the engine in maintaining a constant speed. (at motorway speeds). I usually cruise between 120 - 140kph, and rarely use the cruise control, I use manual paddle mode and switch to ratio 6, this seems to provide better results than the cruise control computer.
On a flat motorway section, I can see the system is using both electric and engine, and if I ensure no extra load than just maintaining speed, then I usually have long stretches of 60+ mpg displayed. My best so far is 25 mins driving at 140kph and having 60+ mpg for the entire time.
I find it enjoyable playing with driving style to achieve the best result, increasing speed without extra mpg on any downhill section, and allowing speed to decrease on small uphill sections, all the while the mpg remains the same or gets better.
Sport mode to overtake, or just have a little fun, accelerating away from toll booths etc, it is uncanny how all other cars are left dead.
Or on empty B roads etc, but it all averages out, leaving usually 45-48 on the display. If I drove more economically Id be sure Id achieve 50+