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.

State gas prices declined last week and reached an average of $4.36 per gallon of regular fuel on Monday, down from last week's price of $4.44 per gallon, according to the U.S. En

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?