You know, I always thought that was odd.
In Nebraska, there's always three pumps--one for premium, one for regular, and one for regular that's 15% ethanol blend, which is usually about ten cents a gallon cheaper.
The pumps are always clearly marked what they have; I've never seen one that wasn't.
I was suprised when I learned that in some states, they don't have to describe the composition of the fuel at the individual pumps.