most people know not to get gas in that hood at night. Just look around if it doesn't look safe don't stop.
I lived in some of the nastiest hoods in America, (DC, West Baltimore, Southside Chicago) and even I know that.
And I carry. And at 6'2 240, I'm not really a "target" for mugging. But if the sign says MLK Blvd, and I'm not from there, I don't stop to take a pee.