   You're listening to ALL THINGS CONSIDERED from NPR News. I'm
Robert Siegel. Here's a case where the law of supply and demand
doesn't play out in quite the way you might expect. The United
States is making gasoline like crazy, and it's been adding
capacity to make more. For instance, Shell and Saudi Arabia's
national oil company have more than doubled the capacity of a
refinery in Port Arthur, Texas, making it the largest in the
country. But all that production is not driving gas prices down
at the pump. NPR's Jeff Brady explains why.  JEFF BRADY, BYLINE:
The refinery business has been going through a tough period in
recent years. Americans are buying less gas and other petroleum
products - about 10 percent less than in 2005, according to the
Department of Energy. Across the country, refineries are
shutting down because they're no longer profitable. It's
surprising then to hear someone in the oil business, like Bob
Pease, get excited about a refinery expansion.  BOB PEASE: So,
this is the largest manufactur