I've got to be be honest otto at the first fill up after seeing the gauge it crossed my mind too, although I never for one moment thought this would be the case.
I did go kind of mega mental, my hid suggested you can't expect Renault to fill up every new car's tank with petrol just to find out if the gauge is working correctly...
I agree with hids logic but I don't believe for one moment there isn't a way to carry out a test on the fuel system at either the goods in-wards or the completion of the manufacturing stage using electronics.
There definitely is a test for everything.
It's niggles like these that put me off buying another Renault