Yeah, I stop at the new Bucky's at the Hwy. 80 / I-20 junction on my trips back to Louisiana. I didn't see where they were using that old joke - the truck stop diner / gas reference goes back forever. I remember seeing a wall poster at some store with that "sign" back in the '70s (Spencer's Gifts, perhaps).
FWIW, there's not much difference between the regular Joe's and the hot version. Teeny bit more cayenne, I think. Try the original (which was sold for around twenty years before the hot version was added).
You are right I remember that joke from way back, now that you mention it. I haven't seen the “ eat here and get gas” sign at Buckys lately but then we haven't traveled much lately.
Sometimes when you are traveling east on I-10 from San Antonio, the exit to Buckys will be stopped up with cars getting off there to get gas or what ever. Backed up onto the highway. Popular spot.