Why gas prices have gone up.

The reason gas prices have gone up in the past week is because of falling refinery output.  In fact, more volatility in prices is expected as refineries switch from winter-blend fuel to summer-blend.  The cost increase has led AAA to list Ohio on it's "Top Ten Most Dramatic Weekly Changes In Gas Prices List."  They said Ohio prices are up 34 cents from this time last year.  

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