Gas Gauge Reading

When I fill my gas tank (in other words, until the pump clicks off on its own) the dashboard gas tank gauge is at only at about 3/4 full. Itdoesn’t seem to be the type of needle that shleps its way up after a few minutes. So I continue filling on my own until I have as close to a full tank as I can get without any overspill. What’s up with that??

By Chance, Is This Nissan Sentra Associated With Any Particular Model-Year ?
Are You New To This Car ? Has It Always Done This Or Is It Something New ?

CSA

I got it new, a 2009 model. But I think I found out why it’s happening (see my response to earlier postings).
Thanks!