My Focus is also 16 at idle. It has to be open a little bit to allow enough air through for the engine to idle. On some cars, this scale starts at zero, but it's never really closed all the way unless it has a separate idle circuit.
'67 Mustang - out of commission after an accident
'00 Echo - DD
'11 Kia Rio - Wife's DD
'09 Harley Nightster - 48mpg and 1/4 miles in the 12's