The Walmart culture is to beat their suppliers down to as low a cost as possible. My sole opinion is that this could very likely result in a corresponding reduction in quality. I can see what's in a can of string beans, but not in their gas or oil. This may be why some auto manufacturers are starting to list recommended gasoline brands in their owner's manuals. I had a cheap, skeptical, friend complain about the way his wife's Saturn was running. He filled up with some branded gas. Problem solved. I've got the popcorn in the microwave!