light on when 10 gallons down
Newly purchased 2010 Corolla with 880 miles on it altogether. Average mpg is about 30. Full tank when delivered. Filled it up at about 300-mile mark when the gauge was low to the bottom (no light though) -- 10 gollons of gas.
Then, around the 600-mile mark, the gas light was on befoe I noticed the gauge was low. Filled it up with another 10.xx gallons of gas.
Now, at the 880-mile mark, the light is not on yet. Will fill it up soon, probably right after it passes the 900-mile mark.
So, for my Corolla at least, the light seems to kick in when 10 gallons of gas are consumed. Note that the capacity of the tank is 13.1 gallons.
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