Ok I've read the other threads on this and still sort of lost. I filled my tank last night after it was on one bar. No idea if it gives a warning when it's at a certain level so I always fill on the last little bar. I have a 2005 if it matters. I filled it up and the nozzle clicked at about 7 gallons. I tried again and it clicked so figured it was full. Is it possible to still have 3.9 gallons in the tank with that one bar left? The bladder can't shrink and expand this much can it?