It's due to the shape of the tank, it could be considered hour-glass shaped, large at top and bottom and small in middle.
This will cause the gauge to take a longer time to drop from full to 3/4. then quickly down to 1/4, then a long time to true empty.
The problem with the low fuel indicator though is it comes on when the float reaches a particular spot on the scale even though there is still ample fuel left.
Unless that location can be changed there is no fix available. It may be an actual marker on the scale or it may be programming.
"V" Rod Forman, '04 Anodized "B", 50th B-day gift from wife.
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