[07b2300]

Great example. I have to say that I'm with you. I can't imagine the dixie cup's open end to the airstream would be better than the closed end. Even the stagnant air in the back of the truck w/ tailgate up is not complete and blows forward. As a kid I remember sitting in the back of a dirty pickup behind the cab and having all that dirt blowing into my eyes. So if the dixie cup is sideways to an air stream and there is still some drag, it seems like there would be even more drag if the open end of the cup faces the air stream.