Tank reserve question

[Interleukin]

I have only had my H3 for about 6 weeks now and I am getting about 300 miles on a tank of gas. As you know, the H3 has a 23 gallon tank and the last 3 times I have filled up is when my "low fuel" indicator comes on (say within 5-10 miles or so).

Each of the last 3 times, I have only been able to put roughly 19.5 gallons in. Thus, is the "reserve" in the tank after the low fuel indicator comes on about 3.5 gallons or so?? If so, I'll drive a little further