I'd say go back to the station, and ask the clerk if he knows.Dang. OK thanks Monocrom.
What got me on this quest was a recent day where I picked up a cup of medium roast coffee at a gas station - just their regular house blend - and it turned out to be the best, most flavorful and satisfying cup of coffee that I've had in at least a decade. I've since been trying to figure out just what kind it was. The label on the machine didn't offer any real clues.