In my neighborhood we have Jewel grocery stores. A few years ago they started selling gas (cheaply). Last year they all became Shell branded with a Jewel Express convenience store. Now that means that at one intersection there is a Jewel Express/Shell station on one corner, and then a regular Shell station right across the street. The prices are the same but I'm pretty sure the owners are different. Would they have the same gas, or do Shell station owners buy gas from wherever?