From howstuffworks.comOriginally Posted by roberth
"So what's the difference between summer-grade fuel and winter-grade fuel? Summer-grade fuel is more expensive for two reasons -- because of the ingredients it contains and because refineries have to briefly shut down before they begin processing it. Summer-grade fuel also burns cleaner than winter-grade fuel. This just means that it produces less smog and releases less toxic air pollutants. The actual difference in cost of production varies. One estimate claims an increase of only 1 cent to 2 cents per gallon [Source: Slate], while another states 3 cents to 15 cents per gallon [Source: Reason]. No matter the difference in production costs, the increase at the pump is even greater, owing to the summer driving season, dips in supply, maintenance costs and companies' converting to production of summer blends."
With this in mind, you should start seeing the price decline when:
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