I believe there is a change between the winter gasoline blend and the summer gasoline blend. There are also some political tensions which is causing the increase in the price of gasoline. Those who are on the west coast (united states) might see higher prices due to a fire at a BP refinery in Washington (I think?) which caused it to shut down. This refinery was a large producer of oil, so it being shut down did some damage. Cyclical price increases along with political tension and decreased amounts of supply.
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