Why are gasoline prices higher in some regions?

Although gasoline prices vary over time, they are often higher in certain states or regions. In addition to differences in state and local taxes, other factors contribute to regional differences in gasoline prices, including distance from supply, supply disruptions, and retail competition and operating costs.

Distance from supply usually means higher prices

Retail gasoline prices tend to be higher the farther gasoline is sold from the source of supply, because transportation costs increase when the distance from the source of gasoline supply increases. These supply sources include refineries, ports, and pipeline and blending terminals.

Locations of U.S. petroleum refineries, product pipelines, and ports

Source: U.S. Energy Information Administration, U.S. Energy Mapping System

Supply disruptions can cause price increases

Events that slow or stop the production of gasoline can prompt increased bidding for available gasoline supplies. Pipeline disruptions, planned or unplanned refinery maintenance, or refinery shutdowns—such as those that occur when hurricanes hit the United States—may cause increases in gasoline prices. If the transportation system cannot support the flow of surplus supplies from one region to another, prices will remain relatively high.

A map of the United States showing states amd cities in Petroleum for Administration for Defense Districts.
Click to enlarge »

Regular grade gasoline average annual prices at retail outlets by region, 2017
(dollars per gallon, including taxes)
East Coast $2.387
     New England $2.425
     Central Atlantic $2.500
     Lower Atlantic $2.290
Midwest $2.311
Gulf Coast $2.179
Rocky Mountain $2.407
West Coast $2.880

Retail competition and operating costs play a role in pump prices

Pump prices are often highest in locations with fewer gasoline stations. Even stations located close together may have different traffic patterns, rent, and sources of supply that influence pricing.

Environmental programs add to the cost of production, storage, and distribution

Some areas of the country are required to use special, reformulated gasoline that includes additives to help reduce carbon monoxide, smog, and toxic air pollutants that result from burning or evaporating gasoline. About one-third of the gasoline sold in the United States is reformulated. Other environmental programs have placed restrictions on fuel transportation and storage. These programs tend to add to the cost of producing, storing, and distributing gasoline.

Why are gasoline prices in California more variable than prices in other states?

California gasoline prices are higher and more variable than prices in other states because relatively few supply sources offer California's unique blend of gasoline outside of the state. California's reformulated gasoline program is more stringent than the federal government's program. In addition to the higher cost of this cleaner fuel, state taxes on gasoline in California are higher than they are in most states.

California refineries need to run at near full capacity to meet the state's gasoline demand. If more than one of its refineries experience operating problems at the same time, California's gasoline prices can increase substantially. Even when supplies are available from other West Coast refineries, U.S. Gulf Coast refineries, or from foreign refineries, they can take a relatively long time to arrive in California.