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.

Retail prices for regular grade gasoline in California are already consistently higher than in any other state in the continental United States.

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