A fire at a crude unit at the Chevron Refinery in Richmond on Monday is driving up Bay Area gas prices.
Gasoline is like all commodities: When the supply is cut and there is no corresponding decrease in demand, the price increases. The size of the increase will depend on how much and for how long the supply is affected.
Gas prices around Larkspur and Corte Madera jumped anywhere between 10 and 20 cents within 24 hours. Prices haven't yet broken the $4 barrier for regular at most stations in town.
The average price for gas in California is $3.875, according to AAA's Daily Fuel Gauge Report.