You originally said "it all goes 'orribly quiet when you run out". In fact, it doesn't.
That's why you changed the story to "marked reduction". The only thing "marked" about it is how little the noise level changes.
You originally said that light aircraft fuel measurement systems, including flowmeters, are notoriously inaccurate; even more so than on heavy metal. In fact, good systems on bugsmashers are highly accurate.
That's why you did the usual trick of trying to confuse with irrelevancies.
I much prefer evidence based decision making.
You should try practising your preference in this case.
