Tank size

[Dead Eye]

You aren't going crazy, mine does something very similar. In fact I usually have over a gallon of fuel left when the light comes on. I've found I can let the needle drop to the middle line of the 'E' and I still have 1 or 2 litres left in the tank

As far as im concerned, the red light is a scare tactic to make you fill up sooner and avoid running out of fuel as there is no onboard reserve fuel