Also: if you're smart enough to steal 75 million credit card numbers, and you've just stolen 75 million credit card numbers, I assume you're going to think of some clever way to start defrauding 'em. Unless I'm missing some part of this story (have the numbers been published somewhere already?), going out and buying gas is the dumbest thing you could possibly do -- parking your own car in front of a security camera and making a transaction which even Capital One knows to flag as potentially fraudulent.
Come to think of it, though, what is the sensible way to use some vast number of credit card numbers to enrich yourself? I assume small-time credit card thieves can get away with it because they're sufficiently small-time to escape an in-depth investigation, but is there any way to untraceably pay yourself?