Why Gas Prices Are So High in California

While national crude prices set the floor, California’s taxes, climate rules, unique fuel special blend, and diminished refining system raise the price per gallon.

California gas is expensive for two overlapping reasons: it is structurally more costly than in most other states even in normal times, and the 2026 global oil shock has hit the state harder than the rest of the country.

As of mid-September 2026, regular gasoline in California averages about $5.89 to $5.97 a gallon versus a U.S. average around $4.27 to $4.31.

Diesel costs are even more extreme, with statewide averages over $8.00 per gallon, even topping $9.00 per gallon in some counties.

Oil is priced globally, and while the U.S. is “energy independent,” it does not mean the U.S. sets its own gasoline price or that domestic crude automatically stays cheap at the pump.

Oil trades as a global commodity, so U.S. gasoline prices follow international crude benchmarks, even when the country produces more oil than anyone else and is a net exporter of petroleum products.

The U.S. is the world’s largest oil producer and a net exporter of petroleum products.

Global market, not a closed U.S. market

Crude oil trades as one interconnected commodity.

A barrel of similar quality from Texas, the North Sea, or the Middle East is valued against the same worldwide supply-demand balance and the same set of risks. Refiners then pay that price or lose supply to exports.

U.S. consumption of petroleum products is still far larger than domestic crude output – approximately 20 million barrels per day of products vs. roughly 13.5–13.8 million bpd of crude in 2026. The country remains a net importer of crude oil even while exporting refined products. 

The result is a structural swap: the U.S. exports most of its light crude and imports heavy crude mostly from Canada, so refineries can run efficiently. Those imported barrels are bought at world prices. Retrofitting plants is expensive and slow. 

What you actually pay at the pump

The U.S. Energy Information Administration standard four-part breakdown of U.S. retail regular gasoline prices treats crude oil as the largest component, and longer-run averages sit right in the 50–52% range.

The EIA explains:

Gasoline types

Gasoline is sold based on octane levels in three primary grades of gasoline:

• Regular
• Midgrade
• Premium

“The octane level indicates gasoline’s resistance to combustion. Gasoline with a higher octane is less prone to pre-ignition and detonation, also known as engine knocking. Refiners charge more for higher-octane fuel, and premium-grade gasoline is the most expensive. From 1995 through 2006, the price difference among grades of gasoline was typically about 10 cents per gallon. Since 2006, the price difference among gasoline grades has generally increased. In 2025, the national annual average price of midgrade gasoline was about 57 cents per gallon more than regular-grade gasoline, and the average price for premium-grade gasoline was about 93 cents per gallon more than regular-grade gasoline.”

From an average low of $1.25 per gallon in 1990 under President George H.W. Bush, to an average high of $4.93 per gallon of gas in 2022 under President Joe Biden, the upward trajectory is interesting.

Gasoline retail prices

The retail price of gasoline includes:

• The cost of crude oil
• Taxes
• Refining costs and profits
• Distribution and marketing

Those shares move inversely with crude: when oil prices rise, crude’s percentage of the pump price grows; when oil falls, taxes and logistics become larger shares of a cheaper gallon. 

Limited spare refining capacity and regional rules, California’s special blends and high taxes, add extra volatility.

Why California is always more expensive

Even before the Iran war, California’s highest-in-the-nation gas prices were already up 80 cents per gallon prior to the war with Iran, while the rest of the country was enjoying some of the lowest priced gas in years, the Globe reported in March.

The EIA reports annual averages were about $2.14 in 2016, $2.17 in 2020, $3.95 in 2022, $3.30 in 2024, and $3.10 in 2025; the latest months of 2026 are back above $4.00.

Robert Rapier of Shale Magazine, a chemical engineer in the energy industry, the Chief Energy Analyst for Energy Network Media Group and Editor-in-Chief of Shale Magazine, published USC Professor Michael Mische‘s 2025 report, A Study of California Gasoline Prices, which clearly explains why California’s fuel costs are so high—and why they’re likely to remain that way:

Seven Reasons Your California Gas Tank Costs More to Fill

1. Special Blends, Special Costs

California’s mandated CARBOB gasoline blend might be cleaner, but it comes with a hefty price tag. Between this specialty formula, seasonal reformulations, and Cap-and-Trade compliance, we’re talking an extra $0.47 to $1.15 tacked onto every gallon before it even leaves the refinery.

I’ve talked with refinery operators who describe the compliance process as “jumping through flaming hoops while carrying water buckets.” The engineering challenges alone are massive.

2. The Tax Man Cometh… and Cometh Again

While politicians point fingers at oil companies, Sacramento quietly collects about $1.64 per gallon in taxes and fees – by far the highest in America. Next time you wince at a $100 fill-up, remember that roughly $30 went straight to government coffers.

The irony? Those refiners being vilified often make mere pennies per gallon in profit during normal operations. One industry veteran told me, “Some quarters we actually lose money on each gallon of California gas we produce.”

3. Dependency by Design

Remember when California was an oil powerhouse? Those days are fading fast. The state now produces just 23% of its crude needs, importing over 60% from places like Ecuador, Saudi Arabia, and Iraq.

Every tanker that docks in Long Beach represents both transportation costs and vulnerability to global markets. When tensions flare in the Middle East, Californians feel it first and worst.

4. Refinery Exodus

You can’t sell what you can’t make. California’s refining capacity has been shrinking for years, with Phillips 66 and others closing facilities. Another 8.6% of capacity is expected to disappear soon.

(Valero’s Benicia refinery closed April 2026).

As one refiner manager told me: “We’re constantly weighing whether the investment to keep this place running is worth it, given the regulatory landscape.”

5. Pipeline? What Pipeline?

Unlike states east of the Rockies, California has no crude oil pipelines crossing its borders. We’re essentially an energy island, forced to rely on ships and limited rail capacity to bring in fuel.

This isolation isn’t just expensive – it’s precarious. When a refinery goes offline for maintenance (or worse, an unplanned outage), there’s no quick way to bring in replacement fuel from neighboring states.

6. Business Climate Colder Than San Francisco Fog

Since 2018, over 360 energy-related companies have packed up and left California. That exodus takes with it jobs, tax revenue, and critically – investment in energy infrastructure.

One former California oil executive who relocated his company to Texas told me, “It wasn’t just the regulations themselves – it was the constant moving of goalposts and the openly hostile rhetoric from officials. Eventually, you go where you’re welcome.”

7. The 2035 ICE Ban Shadow

“Finally, the state’s aggressive push to ban the sale of internal combustion engine vehicles by 2035 creates a chilling effect on long-term investment in fuel infrastructure. Why would companies invest billions in refining, storage, and distribution assets in a state that has openly stated its goal of making those assets obsolete?”

Shale Magazine says “the Bottom Line is that California’s painful gas prices aren’t accidents or the result of corporate villainy – they’re the predictable outcome of policy choices made over decades. Multiple investigations by federal and state agencies have repeatedly found no evidence of price gouging, which has been Gov. Gavin Newsom’s accusation.

“What they have found is a perfect storm of regulations, taxes, import dependency, and shrinking infrastructure that guarantees Californians will continue paying premium prices for their mobility.”