(Cleveland) - It appears the surge in gasoline prices across the Great Lakes states is soon to be over.

For the last four consecutive trading sessions, spot gasoline prices (which influence retail) have dropped a healthy amount, according to Senior Petroleum Analyst Patrick DeHaan at ClevelandGasPrices.com.

 The sudden change comes as ExxonMobil reports its Joliet, Illinois, refinery back online, and with it, an expected increase in gasoline production.

Perhaps the best news was from the Energy Information Administration Wenesday, highlighting a healthy increase in the amount of gasoline supply in the region, likely as motorists curb their consumption of record high priced gasoline.

"The last seven days have seen some shocks at the pump for motorists in the nation's Great Lakes region," said DeHaan. "But perhaps the best news is that the worst is now over and we expect some well needed relief in the days ahead for areas of the Great Lakes, especially Michigan, Illinois, Wisconsin, Indiana, and Ohio."

DeHaan thinks prices could fall 15¢ - 30¢/gallon in the next week.

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