I know the answer...

heheh. Actually, I don't believe it's B.S.
The gas prices rise and fall with Bush's approval ratings. When his approval is on the rocks, the gas prices go down to make us less edgy about it, but once he feels safe again, they start to climb. Before Katrina, they were steadily rising (if you recall, they were already rediculous before Katrina). A few weeks after Katrina, they plummetted. After he lost his nominee for the Supreme Court, they went down some more. When he gave that "heartfelt" speech a week or two ago (which gave his ratings a boost) the prices have been steadily climbing since.
I'm not citing a source here, it is my own observation.
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The recent sudden decrease (about a dollar, wasn't it?) happened because gas companies were being accused of capitalizing on the scare that Katrina was going to screw up the gas prices. Granted, it was going to happen, but since transportation and refining takes about three months, it shouldn't've raised so much so fast. So, the gas companies got in trouble, and they lowered it, and it was stable for quite a few weeks. and all of a sudden BAM.