I was reading some articles about the fluctuations in gasoline prices recently, and saw some interesting details. For instance, check out this article on Business Week [businessweek.com]:
"Gasoline demand typically drops in the fall, and beginning Saturday, refiners will be able to sell cheaper winter-grade gasoline."So, one of the reasons why gasoline prices typically decline in the fall is because the oil companies are able to produce cheaper gas. This detail kind of intrigued me, so I decided to see if I could learn more.
I then found a few sites which essentially had the same information, but is most clearly explained by this site [vinefuels.com]:
"The main difference between gasoline made for cold weather use and hot weather use (or winter and summer grades) is a higher volatility type gasoline for winter use, and a lower volatility for summer use. When cold, gasoline will vaporize in the carburetor more slowly, so it is made with a higher volatility to help it vaporize faster. This makes for better engine-starting when the weather is cold. On the other hand, when gasoline is made for hot weather, it has a lower volatility rating, so that it doesn’t vaporize in the fuel system before it reaches the carburetor, causing what is commonly known as 'vapor-lock' which stalls the engine until the system is cooled... Government regulations are now imposed on refineries, terminals, and fuel distributors that mandate when these winter/summer changes are to be made."
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