I'm new to the i3, so I am asking a question the answer of which may be obvious to everyone else. The range on the 2019 is officially listed as 154 miles, but when my car is fully charged it says 177 miles. My question is this: what then is the car's range? Obviously enough driving experience might give me a better clue, but until we get there, why the disparity between the published range and the range reflected on the display?