What about the other car at the pump? Maybe they paid with credit and LE already talked with them, but is van guy the only guy that might have paid with cash and they didn't know who he was? No other mystery customers that day?
http://thegazette.com/wp-content/uploads/2012/08/whitevanevansdale485.jpg
Don't know...maybe he saw somebody..something to do with Linn County...something to do with Casey's.