Why are West Coast diesel fuel prices higher and more variable than others?
Diesel prices on the West Coast, especially in California (CA), are relatively higher than other regions of the country, partly because of taxes, but mainly because of supply issues. The State of California assesses a combined State and local sales and use tax of 7.25% on top of the 24.4 cents/gallon Federal excise tax and an 18.0 cents/gallon State tax. Washington’s tax of 34 cents/gallon is one of the highest in the country. Besides taxes, West Coast retail prices are more variable than others because there are relatively few supply sources: 21 of the 36 refineries located in West Coast states are in CA. California refineries need to be running at near full capacity just to meet in-state demand. If more than one refinery in the region experiences operating difficulties at the same time, the diesel supply may become very tight and prices may spike. The West Coast’s substantial distance from Gulf Coast and foreign refineries is such that any unusual increase in demand or reduction in s
