Keep in mind that, in many states, the stations don't need to disclose the use of ethanol.
If the blend is mandated, they can refer the resulting product as gasoline. Advertising embellishment (puffery) such as "100%", "pure", "all" is unquestionably fine.
It's a bit of a grey area to claim ethanol free, which is actively misrepresenting the product (what non-lawyers would call "a blatant lie"), but they could probably get away with it.