Can't count the times I've seen cars and trucks driving around with
gas door open. More than once the cap was also dangling!!
Once saw a lady sitting at the exit of Wallyworld with her cap dangling.
I pulled up behind and jumped out and ran up to her window and yelled
I was going to put her gas cap on.
She looked startled and then appreciative. On retrospect I'm lucky she
didn't shoot me or something!! I didn't think about scaring her until after
Bottom line is many folks don't check rear view mirrors often or at all.