"C J Campbell" wrote in message
You were taught a very popular myth. No doubt you were also taught the myth
(spread by Rod Machado and others) that your fuel gauge is only required to
be accurate when it reads zero fuel.

The myth is that they have to only be accurate at zero. The truth is that there's
no requirement for accuracy at all. All the misinterpreted rule says is the EMPTY
mark means zero USABLE fuel.