Quotes from the news wire:
She would go out, she'd write down tags, print out the receipt and put it to the side, for a while, I'd go in every couple days, I'd walk in and she would have an envelope there for me, full of transactions. I'd go back and say, 'OK I know this guy, I know him, but I don't know this guy. Let's figure out who this guy is to see how he fits in the network.'.
Typically, they'll go in because credit cards restrict the maximum amount of fuel you can put in a vehicle, which is usually $75, so they'll make anywhere between two and eight transactions at different gas stations in a day, they use one credit card and they pump three times for $75. And then they would go to another gas station and do the same thing.