Much of the most intense volatility occurred during 2008 when gas prices broke the $4 barrier and then subsequently collapsed as the economy unravelled. But even in 2009, gas prices are changing 5 cents per week, on average.Is 5 cents a lot? The answer depends on what you mean.Five cents is a lot historically. From 1993 through the end of 2007, gas prices changed by just 2 cents in an average week. Expressed as a percentage of gas prices, the average weekly price change represented less than 1.4 percent of the retail price of gas during that period (when gas prices were much lower). In 2009, by contrast, the 5 cent weekly change represents 2 percent of the retail price.
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