Here’s a little-known fact about the U.S. Postal Service: Since 2001 it has participated in what’s called the Mail Isolation Control and Tracking program,… Consumers paying attention to the price of crude oil this spring may have wondered why gasoline prices were slow to fall while oil prices were plunging. … Consumers paying attention to the price of crude oil this spring may have wondered why gasoline prices were slow to fall while oil prices were plunging. After regaining stability in May and June oil prices are falling again, with some analysts predicting they could touch $30 a barrel before the end of the year. But if they do, it doesn’t necessarily follow that gasoline prices will go below $2 a gallon as many consumers would like. For crude oil to become gasoline it has to pass through refineries, and that’s where bottlenecks tend to occur. When refineries don’t keep up with the demand for gasoline, for whatever reason, the price tends to go up. But dirt cheap oil, and gasoline that’s only relatively cheap, translates into fat profit margins for refineries. Major refiner Valero Energy reported a quarterly profit of $2.66 a s...