Im certain they are selling regular fuel from their premium dispensers. I have a cadillac that requires premium fuel, and when i put regular fuel in it has to retard the timing so much that it starts quitting at stop lights and lurching at low speeds. On may 23, 2010, i was on empty, put 40.07 of PREMIUM fuel in, and less than a block from the gas station my "service emissions system" warning came on, check engine light came on, and started lurching under 50kph, when i was nearing my destination that evening it QUIT at 50kph as i... read full review »