It's a poor fuel gague calibration. OEMs think that people want to see it that way and feel better about their fuel economy. I personally hate my car lying to me.
Just reset and watch the trip odo. In my 3400 I had to get gas at 300 miles in winter or I was in danger of running out (I had a 70 mile round trip to/from work).
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Moved on to smaller and better things.
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