Yes, what the others have said. Let me add this:
Subtract about 2-3 to get an accurate reading.
Thx found it and reset it. By hand calculation the last tank only got 11.9 MPG. Mostly city short trips with lots of stops and goes in new York city. Still a bit low though. Just did annual inspection with no problem and changed engine oil and filter. Will see next tank with perhaps summer blend.