The way I've seen it done around here (Southern California) is more social hack than technical hack: the enterprising miscreant comes up to you with a gas canister while you're pumping and gives you some sob story how he lost his wallet and needs a few gallons to get back down to San Diego.

The article involves a scam that is slightly larger potatoes and was newer than I expected. I was under the impression that skimmer problem had been largely neutralized (not sure where I got the idea, maybe something to do with new chip card rollout). Guess not.