Cash prices for Chicago ultra-low sulfur diesel tumbled to a four-year seasonal low on Friday, as Midwest refiners struggle to find buyers amid weaker seasonal demand, while they run full-tilt to capture strong margins for the product, traders said. Midwest refiners are running at the highest rates for this time of year since 2014 to chase a distillate refining margin that is the strongest in five years. However, refiners seeking to sell the product are contending with typically weaker seasonal demand this time of year, traders said. This has sent prices in the region plummeting from a one-year high reached in mid-November when distillate stockpiles fell due to a lengthy refinery maintenance season and strong product buying. (For a graphic on Midwest distillate inventories, see: […]