I work in the industry and they circumvent the supply/demand effect by saying that the current gas pool was made from higher priced oil, therefore the price should remain higher even if the prices of oil come down. But as soon as any threats come, the price of gas jumps up even though supply far outweighs demand, but they get away with it because of the fears of a cutoff supply if the storms knock out a bunch of rigs in the Gulf. They can make up multiple reasons for raising and lowering prices, but they learned after the 2008 spike in prices, that the American public will pay between $3-4 per gallon without bitching too much, hence the reason the companies and government have fought to keep it in that range. And don't let that $83/BBL for oil fool you. There aren't many refineries paying for this high priced oil. Most refineries I have knowledge about, routinely pay between $35 and $60/BBL. There are costs for processing this cheaper oil (capital equipment, chemical treatment, etc), but they outweigh the expensive oil, resulting in greater magrins. With one single refinery processing a quarter million barrels of oil a day, you can see where the money racks up.
So don't let them fool you with all their tactics.