I think you're good.. in my experience when the gauge is at E I’m are down to About 2.5 gallons. When the light comes on I have about 4.5. I trust at the gauge And ignore DTE..I'm having a hard time gauging If I'm having a problem or not. Typically I fill up right when the gas light comes on. I'll put in about 37L and the car shows that the tank is at F when I'm done.