[BNaylor]

That sounds about right. The tank capacity is 14.1 gallons. When our light comes on it takes about 12 gallons to fill it up.

However, I would not depend on the accuracy of when the low fuel light comes on and whether you really have that much fuel left, especially while on a trip and you are out in the middle of nowheres. When the light comes on it is recommended to get to a gas station as soon as possible. The problem stems from the fuel level sending unit and float getting inaccurate of a period of time or as the car ages. Also, you can have the opposite effect. When the light comes on you could have more than 1.5 - 2.0 gallons. So it will vary for each Alero.