The average fuel price in state declined about 19 cents since last month. According to the EIA, gas prices across the state in the last year have been as low as $4.09 on Dec. 23, 2024, and as high as $4.73 on April 7, 2025. A year ago, the average gas price in California was 4% higher at $4.54 per gallon.

As of Tuesday afternoon, California's average is $4.58 per gallon, less than the average from more than a week ago of $4.65 per gallon, or from a month ago at $4.78 per gallon, according to data from the American Automobile Association.

As an increase in the excise gas tax takes effect comes a separate change related to California’s Low Carbon Fuel Standard. What is that?