Heh I didn't watch all of it but I can relate to the gas fill up hand signal confusion.
Why doesn't someone just walk over, tap on the window, and ask to fill up the tank instead of doing charades?
I'm actually sitting here mimicking that motion trying to imagine if I could ever pick up on that.
I'm sort of self diagnosed. I just go as far as thinking Aspergers in one interesting possibility, but I don't know for sure. I may just as likely have something else going on.