2011 F350 4X4
Join Date: Dec 2010
Location: Santa Fe, NM
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agreed, 2.5 gal should get it above the half way point, especially since it wasn't empty to start with.
Maybe a sensor went bad.
I have 4100 miles on mine and I haven't seen a warning, nor added any.
The manual doesn't narrow it down much; shows in a pick up, the tank will last anywhere from 1700 miles to over 9000 miles, dependent upon driving style and whether towing heavy loads.