It really varies too much to say. Also, though, remember you get two warnings- a flsahing "low" and a solid "uh oh". Because of the tank spacers mine goes to "low" with nearly a quarter of a tank left, annoyingly, while "uh oh" doesn't seem much changed.
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"We are the angry mob,
we read the papers every day
We like what we like, we hate what we hate
But we're oh so easily swayed"
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