You can't really have a gas station and not declare who are you buying your product from, not even in Mexico. The ones that get away with it have links to organ

You can't really have a gas station and not declare who are you buying your product from, not even in Mexico. The ones that get away with it have links to organized crime, colluded with the authorities. And the locals know because the cartels use those stations to fill their tanks for free, and they do that in convoy. At least it was like that 10 years ago, maybe the cartels are more discrete now.