Okay, update. I called my father, grandfather, and the Shell Station. I have no idea why, since they were all pretty much equal with their "wtf are you talking about Holly" attitudes.
My dad was asleep in front of the TV, informed me that someone was probably pulling a joke on me or I had read some sort of spam and misunderstood it, and told me he'd have to think about it and he'd call me back tomorrow.
My granddad doesn't really understand the internet that much, so after a 10 minute discussion about the definition of a "bulletin board" (he thought I saw the bad gas info hanging on a bulletin board outside the Shell Station ;-), he finally declared that he felt everything would be fine and he'd listen to my car the next time he saw it.
By this time my dad had come out of his sleep fog and he called me back and asked if I had called the Shell Station. Of course I hadn't, so I decided to do that.
Called the Shell, got an old lady on the phone, and she acted like I'd just told her aliens had landed in the parking lot. She could not have been anymore confused. After about 5 minutes of explanations she finally tells me that she's "sure I'm making sense, but she just can't understand me."
So, she puts some dude on the phone who I can immediately tell also has absolutely no fucking clue what I'm talking about and has never heard any of this. BUT --- being a "guy" and all, he wasn't prepared to admit this, so he tried to bullshit along with me and act as if he was completely in charge and in control of the situation ;-} I almost started making shit up, since I know he would have agreed with anything I said at that point. I finally just told him that if he received any notice that the gas is bad, to please let me know, and I hung up. It didn't occur to me until after, that I didn't even leave my name or number.
So, who knows? My car may or may not blow up. Even if the shit is bad, I don't know what I could do now, anyway. What do you do to get gas out of a car??? I'm definitely not sucking on any hosepipes.