Probably a poor selection, or some who drives a “performance” vehicle for pleasure, or possibly an older vehicle The only real thing to concern yourself with is that there has has not been sitting for a long time (weeks/months), but any popular station will have multiple deliveries a week. Get the cheap stuff. If you feel guilty you can run a cleaner and dryer through the system occasionally, but modern consumer vehicles are pretty well designed to function efficiently on a range of gasoline-based fuels.