Here is my trip to work and back.
It's a 15 minutes, 13 Km trip, something like 3 Km of urban roads at the beginning and the end, and a small town in the middle.
Road is plain, no hills or overpasses: according to wikipedia, my hometown is 9 meters lower than my workplace.
Energy balance is even: battery gauge was at level 3 both at the start and the end.
Here is the trip from work to home:
Minutes -3, -8 and -15 are totally in EV mode.
Minute -15 was spent while exiting from the parking, while during the others I was actually driving.
Average is 4.6 L/100km
And now back from home to work:
First 2 minutes in EV, while driving around home, then again minutes -1, -3, -4, -7, -8 all electric.
Average is 3.5 L/100km
I don't use the ECO-mode nor EV-mode buttons.