Today, 13.05.2008, Diesel temporary cost more than 91-octane petrol. It was the first time I saw this EVER in my country! To make it clear: petrol wasn't cheaper than yesterday, Diesel was just more expensive. Nobody can tell me that this is a purely economical consequence of supply and demand. Without going into details: petrol and Diesel are extracted from petroleum in a more or less constant ratio. A higher Diesel production following higher Diesel consumption means more and therefore cheaper petrol. But for some reasons this locic doesn't reach the petrol stations...