The sensor is erring on the side of caution. It doesn't want you to use 18.9 gallons before going to the gas station, so it's gonna preemptively warn you to fill up.
As stated in a thread started by me, if you're driving "spirited" prior to getting low on gas, it's going to be that much more cautious in it's prediction of hitting empty.
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"Any man who can drive a 370z while kissing a pretty girl is simply not giving the Z the attention it deserves." Albert Einstein....modified.
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