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NEW YORK -- Gas prices across California have soared to record highs, shooting up 50 cents a gallon in just the last week.

But even as prices are expected to rise slightly higher in California before falling, the West Coat price spike is not likely to spread to other parts of the country, experts say.

The average price of a gallon of regular gas in California hit $4.67 a gallon on Monday, according to AAA. It stood at $4.17 on Oct. 1 but has risen every day since then. The worst was a 17-cent spike on Friday, followed the next day by a 13-cent increase.

On Sunday, California environmental regulators, acting on a request from Gov. Jerry Brown, agreed to allow refineries to start making a cheaper, winter blend of gasoline as soon as possible -- a move that could solve shortages of the more expensive summer blend that sparked the price spike.

Normally, refineries wouldn't start making the winter blend until the end of October.

Most of the country makes the transition from the cleaner summer blends of gasoline to the cheaper winter blends on September 15. California, with warmer average temperatures and the nation's strictest air pollution rules, makes the transition six weeks later.

The cleaner gasoline is used in the summer to mitigate against the smog that accompanies warmer temperatures.

The switchover can often cause shortages of the summer blend and a temporary rise in prices. Refineries and stations don't want to have an inventory of the more expensive gas when it is time to start selling the cheaper gas.

Refining capacity is also an issue. Tom Kloza, chief analyst at the Oil Price Information Service, which compiles prices for AAA, said a major refinery in Richmond, Calif., owned by Chevron (CVX, Fortune 500), still hasn't returned to operation since an August fire.

More recently, California refineries owned by Tesoro (TSO, Fortune 500) and Exxon Mobil (XOM, Fortune 500) were also off line for maintenance, although the Exxon refinery came back on Friday, while Gov. Brown said the Tesoro refinery is due back in operation this week.

But Kloza said supplies are so tight that those latest disruptions caused wholesale gas prices to spike by $1.12 a gallon to $4.15 a gallon between Sept. 25 and Oct. 4.

He said the wholesale prices have already started to fall, dropping 47 cents on Friday and about 38 cents more in early trading Monday.

"I don't want to say the coast is clear but there is a light at the end of the tunnel," Kloza said. California retail prices are likely to top out at about $4.75 a gallon and then start to decline, he said.

The spike in California comes while gas and oil prices have remained relatively stable in the rest of the country. The national average for a gallon of regular gas has kept to a narrow range of between $3.78 and $3.82 during the last week.

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