Low Fuel.
I have a buddy and we were driving back from the mountains (about a 2 1/2 hour trip) anyways we were half way back when his overhead said 0 we drove for another hour before we got to his house without a problem and he was not driving it light either haha. He has an 04 1500 4.7.
Here is what it says in the service manual about the low fuel light.
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Low Fuel Warning - The instrument cluster
chime tone generator will generate one chime tone
when the low fuel indicator is illuminated by the
instrument cluster. The instrument cluster uses a
percent tank full message input received from the
PCM over the PCI data bus indicating that there is
less than about one-eighth tank of fuel remaining to
illuminate the low fuel indicator. This chime feature
chime tone generator will generate one chime tone
when the low fuel indicator is illuminated by the
instrument cluster. The instrument cluster uses a
percent tank full message input received from the
PCM over the PCI data bus indicating that there is
less than about one-eighth tank of fuel remaining to
illuminate the low fuel indicator. This chime feature
will only occur once in an ignition cycle.







