The word I had from the LA Dept. of Agriculture was this:
"Labeling of pumps dispensing ethanol blended fuels was not required in Louisiana prior to December 20, 2008. The old law requiring labeling had been repealed in or around 2004. On December 20, 2008 a new rule requiring these dispensers be labeled became effective."
Now that doesn't mean Louisiana will *do* anything about it. Laws here, as in most of the US today, are merely guidelines, to be ignored when inconvenient. Wal-Mart complies, but who knows if the other stations do?
For my part, I'm sticking with stations where my MPG stays up when I use their gas. They're usually cheaper than the big name stations anyway.