no… i’m not kidding. i suppose that my statement was rather unclear. the refinement costs of a sweet vs sour oil is how the prices of the end products fluctuate without the crude prices playing a role. so yeah… i’m not missing the economic model here… it’s pretty simple, nor am i talking about gas prices and oil companys vs opec… i was simply responding to the gasoline vs motor oil question. i know that the demand drives the price and the cost of delivery (of the manufactoring process, not literal shipping) is what is the end result of prices, lets not forget taxes, marketing and good old markup.