EZ -

My experience has been that when you start any trip with 4 bars - you are almost immediately kicked into what I call forced regeneration. This continues even though you may get the SOC up to 6 or 7 bars. It does kill your mileage for that trip. The most frequent way that I end up at 4 bars is all the short distance and stop and go driving I do (uses a lot of assist to get going multiple times, but the car doesn't get up to temp to have the regen braking kick on until my trip is almost over).

Wind and hills are also definite killers. Beyond that - not sure I can add much other than to make sure you have gotten an updated mileage reading (approx every 10 second the avg MPG meter updates - so at higher speeds this is almost every .2 miles). If you opened the car up WOT - did the mileage gauge actually "register" this reading as soon as you looked at it - or did it kick in 7 seconds later? might be something to try again if you're curious. The second CAM band kicks in about 3500 rpm and I try to keep mine below that range always (emergencies excluded) in order to maximize mileage.

Eric