I also tend to fill up when the low fuel level light is on and it's usually around 14 gallons. My fuel indicator light goes on when the fuel gauge is on the second line on the gas indicator. At this point, the cruising range is usually down to 0 miles. However, as I continue to drive, the cruising range jumps back up to about 30 miles. Keep in mind that I still have 3 gallons left in the car.