San Francisco Gasoline Weakens as Shell Nears End of Maintenance

Spot gasoline in San Francisco fell the most in 11 months after Royal Dutch Shell Plc neared the end of a maintenance period for its refinery in Northern California.

California-blend, or Carbob, gasoline in San Francisco weakened by 23.5 cents to a premium of 21 cents a barrel more than futures on the New York Mercantile Exchange at 3:56 p.m., according to data compiled by Bloomberg. It’s the largest one-day drop since Oct. 8.

Shell started maintenance at the 165,000-barrel-a-day refinery in Martinez, California, on Sept. 11 to “optimize operations,” Destin Singleton, a Houston-based spokeswoman for the company, said by e-mail. The work was expected to last five to seven days, according to a filing with Contra Costa County Health Services.

Carbob in Los Angeles weakened by 19.5 cents to a premium of 16 cents a barrel against futures. Conventional, 84-octane gasoline in Portland, Oregon, rose 1 cent to a premium of 20 cents.

California-blend diesel in Los Angeles weakened by 2.25 cents to a 0.5-cent premium to ultra-low-sulfur diesel futures on the Nymex. The fuel in San Francisco weakened by 0.5 cent to a premium of 6 cents.

Low-sulfur diesel in Portland weakened by 1.25 cents to parity with New York futures.

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