my display is putting up weird averages I don't know what they mean

2009 CHRYSLER PT CRUISER
57,000 MILES
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JOHNB4315
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I have a 2009 Chrysler PT Cruiser. It has a trip computer that displays information such as "miles until empty", and "average MPG". When it shows the average MPG I was wondering what exactly IS "average MPG" and how does the computer calculate this?
May 6, 2012 at 10:16 PM
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FIXITMR
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it compares fuel usage to tire rotation.
May 6, 2012 at 11:03 PM
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