Local BP stations switching from 92 to 91?

[Kracka]

I went to 5 BP's yesterday before I finally found one with 92 (according to the stickers). I'd still rather run BP 91 instead of any other local brand 92. I wonder who we can complain to about this because I believe its the individual stations choice whether they have 91, 92, or 93 octane premium fuel (at least thats what I was told by a BP station owner in Duluth).