California has authorized gasoline blends containing up to 15% ethanol, or E15, and the California Air Resources Board (CARB) adopted supporting regulations in September 2026. A study estimate cited by Gov. Gavin Newsom’s office says wider E15 use could lower prices by as much as 20 cents per gallon and save Californians up to $2.7 billion a year. Those are modeled possibilities—not a guaranteed pump-price cut. Fuel providers decide whether to sell E15 and what to charge, and drivers should check their owner’s manual before using it.
What is E15, and what has California authorized?
E15 is gasoline blended with up to 15% ethanol by volume. Before AB 30, California regulations allowed gasoline with up to 10% ethanol, commonly called E10. Gov. Gavin Newsom signed AB 30 on October 2, 2025, allowing blends containing 10.5% to 15% ethanol to be sold while environmental review and rulemaking proceeded. CARB adopted amendments supporting E15 availability and use on September 24, 2026. The governor’s announcement of CARB’s action says the amendments give fuel producers and providers more certainty.
The authorization makes E15 a possible fuel option; it does not require stations to carry it. As CARB put it, “Ultimately fuel providers set the price of gasoline and decide which fuels to sell.”
How much could E15 save drivers?
The governor’s office cites a study by the University of California, Berkeley and the United States Naval Academy estimating that broader E15 use could reduce gasoline prices by up to $0.20 per gallon and save Californians as much as $2.7 billion annually. These are conditional estimates reported in the state’s 2025 summary, not observed savings at California pumps or a promise that every driver will pay less. The state summary says achieving the potential savings would require infrastructure modifications, including at retail gas stations. The governor’s summary of the study does not establish when a particular station will offer E15 or what that station will charge.
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Why California gasoline costs more
E15 is one potential change to fuel options, not a solution to every factor behind California’s gasoline prices. The California Energy Commission (CEC) attributes the state’s higher average prices to its relatively isolated fuel market, a special gasoline blend intended to reduce air pollution, environmental program fees, and local, state and federal taxes. California has no pipelines bringing fuel into the state; gasoline comes from in-state refineries or by marine vessel. Global crude-oil costs are a major driver too, while regional supply routes and station-specific distribution costs also affect prices. The CEC’s gasoline price breakdown describes these cost factors.
Historical price changes should not be mistaken for evidence of E15 savings. The CEC reports that California’s inflation-adjusted annual average gasoline price in 2024 was $0.20 per gallon lower than in 2023 and $0.70 lower than in 2022. It also says 2025 retail prices stayed lower, with a narrower range than in the prior three years. Those comparisons are not attributed to E15. The CEC’s explainer provides the historical context.
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Will E15 be available at your local station?
The rules allow E15 to be sold, but statewide authorization is not the same as local availability. CARB says providers choose which fuels to sell and set their prices. The state’s announcement of the September 2026 amendments does not give a verified statewide rollout schedule, so the timing and availability at an individual station remain uncertain. Ask a station whether it carries E15 before planning to use it.
Can your car use E15?
Compatibility depends on the vehicle. CARB advises consumers to consult their owner’s manual to determine whether E15 is compatible with their vehicle. Its September 2026 announcement does not provide an exhaustive list of compatible models, so do not assume that every gasoline-powered car can use E15. CARB’s announcement and consumer guidance explain its recommendation.
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What CARB found about E15’s environmental effects
CARB says its scientific evaluation found E15’s impacts comparable to E10, with potential for slight improvement in air quality. The board also says the primary health and environmental concerns associated with gasoline blends come from their petroleum portion. These are CARB’s findings; they should not be read as a claim that E15 has no environmental or health impacts. CARB’s announcement summarizes the evaluation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.California’s winter-blend action is separate from E15
On September 28, 2026, Newsom suspended the seasonal summer-gasoline requirement for the remainder of the 2026 season under SB 237 and directed state agencies to enable winter-blend gasoline to be made, imported, distributed and sold immediately. That temporary seasonal measure is distinct from the E15 authorization, which expands the blends that may be sold after regulatory approval. The CEC said it did not believe suspending the summer blend would create a meaningful supply boost large enough to justify potential air-quality and health effects. The governor’s announcement and the CEC’s gasoline price explainer describe the seasonal action and its limits.
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