This article is from the Toyota RAV4 FAQ, by Ralph Becker with numerous contributions by others.
Due to the shape of the gas tank (best described as an Inverted U),
the fuel gauge does not show fuel use linearly. Most report that it is
fairly linear from Full to 25%, then drops rapidly. Others say it tends
to go from Full to 75% very quickly, then goes down at a steady rate.
In any case, you should refuel as soon after the low fuel warning light
comes on as possible.
 
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