Why is California's gas so expensive?
California's pump price has run above the U.S. average in all but a handful of weeks since 2000. Here's what our data shows about that gap — and the well-documented reasons behind it.
California pays about $1.50 more a gallon than the country
This part isn’t in dispute — it’s EIA retail price data we hold directly. As of the week of June 15, 2026, regular gasoline averaged $5.55 a gallon in California against $4.05 for the U.S. as a whole — a gap of about 150.2¢, or roughly 37%. And it’s not a one-week quirk: since 2000, California has sat above the national average in 1,354 of 1,361 weeks (99.5%), by an average of about 59.6¢ a gallon.
Source: U.S. Energy Information Administration, weekly retail price of regular (all-formulations) gasoline — California and the U.S. average.
California isn’t always the single most expensive state — on the latest annual figures (2024) it ranks 3rd of 51, behind Hawaii and Alaska. But those are outside the contiguous 48 — among the lower-48 states, California is consistently the priciest. See California’s live price page for where it sits today.
California’s price since 1970
California’s weekly record high was $6.27 the week of June 13, 2022. Toggle Adjusted for inflation to compare across decades in constant 2025 dollars.
Source: EIA State Energy Data System (annual) for California, regular gasoline. Values before 2000 are approximate (converted from energy-content pricing).
Why the gap is so stubborn
The highest taxes and fees in the country. As of January 1, 2026 the EIA puts California’s combined state taxes and fees on gasoline at about 70.9¢ a gallon — the most of any state and more than double the roughly 33.3¢ state average. [2] The state excise tax alone rose to 61.2¢ a gallon on July 1, 2025 — it’s adjusted for inflation each year by the CDTFA — and sits on top of state and local sales tax and a 2¢ underground-storage fee. [3]
A unique, cleaner-burning blend few others make. California requires its own reformulated gasoline (CaRFG), which the EIA says “burns cleaner but is more expensive to produce because it requires more processing steps and expensive blending components.” [1][5] Just as important, refiners outside the state “only make this blend to supply California’s market” [1] — so when in-state supply tightens, there’s no large nearby pool of compatible gasoline to tap, and prices have to climb enough to pull in cargoes by ship. The California Energy Commission lists this special blend among the core drivers of the state’s prices. [4]
Climate-program compliance costs. California’s cap-and-trade program adds an estimated ~23¢ a gallon at recent allowance prices, according to the Legislative Analyst’s Office. The same analysis notes that figure would reach roughly 74¢ only in a theoretical scenario where allowance prices hit their regulatory ceiling — a cap, not a current cost. [6] The state’s Low Carbon Fuel Standard adds a further compliance cost that refiners pass through into the pump price; the CEC tracks these programs in its per-gallon price breakdown. [7]
A fuel island, cut off from other refining regions. There are no pipelines bringing gasoline into California. As the CEC puts it, the product pipelines that exist “only flow east” to Nevada and Arizona [4], and the EIA notes “no pipelines supply California from across the Rocky Mountains.” [1] Supply comes from the state’s own refineries plus slow, costly waterborne imports — which both raises the baseline price and leaves little slack in the system.
Thin margins mean outages bite hard. With supply running close to demand and replacements days or weeks away by tanker, a single refinery problem can move California prices sharply. The EIA has documented this repeatedly: after the 2015 explosion at the Torrance refinery, California’s gasoline imports rose roughly tenfold as the market scrambled to backfill the lost output. [9] Looking ahead, the EIA warns that the planned closures of the Phillips 66 Wilmington and Valero Benicia refineries — together about 17% of the state’s refining capacity — could not be easily replaced by refineries elsewhere in the country. [8]
And a premium that’s still partly unexplained. Even after taxes, the blend, and known program costs, California prices have carried an extra margin researchers have struggled to fully account for. UC Berkeley economist Severin Borenstein dubbed it the “mystery gasoline surcharge” after 2015 [11], and California’s Division of Petroleum Market Oversight estimated it averaged about 41¢ a gallon from 2015 to 2024, attributing much of it to elevated in-state industry margins. [10] The cause is genuinely debated — Borenstein himself stresses it is unexplained rather than proven price-gouging — so we flag it as an open question, not a settled one.
For California drivers, the gap is structural — not a blip
Most of what separates California from the rest of the country is baked in: the taxes, the required blend, and the climate programs are policy choices, and the state’s refinery isolation is geography. Those don’t change week to week, so California will almost certainly keep paying well above the national average — the usual question is how big the gap gets, not whether there is one. What swings it hardest are the temporary pieces: a refinery outage or a maintenance season can add or remove dozens of cents within weeks. For where the price sits right now, see California’s live gas-price page.
California gas prices, answered
- Why is gas so expensive in California?
- California layers several structural costs on top of the national price. According to the U.S. Energy Information Administration and the California Energy Commission, the main reasons are the nation's highest gasoline taxes and fees, a unique cleaner-burning gasoline blend that only California refineries routinely make, the added cost of state climate programs such as cap-and-trade and the Low Carbon Fuel Standard, and the state's geographic isolation from other refining regions — there are no pipelines bringing gasoline into California, so supply leans on in-state refineries and slow waterborne imports.
- How much more does California pay for gas than the national average?
- As of the week of June 15, 2026, regular gasoline averaged $5.55 per gallon in California versus $4.05 nationally — a gap of about 150.2¢ per gallon, or roughly 37%. California has been priced above the U.S. average in 99.5% of weeks since 2000, per EIA weekly data.
- Is California the most expensive state for gas?
- It is among the most expensive. On the latest annual EIA figures (2024), California ranks 3rd of 51; only Hawaii and Alaska are higher, and both sit outside the contiguous 48 states. Among the lower-48 states, California is consistently the priciest.
- Will California gas prices ever match the national average?
- It's unlikely the gap fully closes. The largest pieces of it — California's taxes, its required cleaner-burning blend, and its climate programs — are long-standing policy choices, and the state's refinery isolation is structural, so California tends to stay well above the U.S. average. What moves the gap most week to week is temporary supply: a refinery outage or maintenance season can add or remove dozens of cents within weeks.
Where the causal claims come from
- [1]U.S. EIA, “Why California usually pays more at the pump for gasoline,” Today in Energy
- [2]U.S. EIA, “Many states slightly increased their taxes and fees on gasoline in the past year,” Today in Energy
- [3]California Dept. of Tax and Fee Administration, Fuel Taxes (motor vehicle fuel excise rate) and Sales Tax Rates for Fuels
- [4]California Energy Commission, “What Drives California’s Gasoline Prices?”
- [5]California Air Resources Board, California Reformulated Gasoline (CaRFG) program
- [6]California Legislative Analyst’s Office, “Assessing California’s Climate Policies — Cap-and-Trade Reauthorization” (May 2025)
- [7]California Energy Commission, Estimated Gasoline Price Breakdown and Margins
- [8]U.S. EIA, “Refinery closures present risk for higher gasoline prices on the West Coast,” Today in Energy
- [9]U.S. EIA, “California’s gasoline imports increase 10-fold after major refinery outage,” Today in Energy
- [10]California Energy Commission, Division of Petroleum Market Oversight, 2024 Annual Report (Oct 2025)
- [11]Severin Borenstein, UC Berkeley Haas Energy Institute, “The Mystery Gasoline Surcharge Gets Some Respect”
Price data throughout is from the U.S. Energy Information Administration and held in our own database. Inflation-adjusted figures use the BLS Consumer Price Index (CPI-U), constant 2025 dollars.