anyone notice varying readings......the other day mine read 1/4 full and then today it reads almost half and I never added any?? Only difference is today it is cooler outside?

 

Could be the early signs of a faulty sensor

 

I was having the same issue followed up with a check engine light for it. Took it to the dealer a month ago and they said Ford was aware and working on a fix. Got a call yesterday saying the parts have been orderd; new tank and sending unit. We will see.