Normal.. it's a gauge..not a precision instrument. We all deal with the same bs. The W aka worthless body cars seem to be the worst offenders I've found

My Regal will toss the light, shoot out the LOW message on the DIC after it gets below 40miles remaining and ..... well let's say I've pushed that envelope way past 40 miles. Filling up, the most I've achieved was 16+ gallons.