Gasoline prices in California have reached an average of $3 per gallon, a level not seen since Sept. 26, 2015. At $3 per gallon, California’s gas prices have risen nearly 40 cents per gallon in the last three months. Part of the blame can be placed on OPEC’s Nov. 30 decision to cut oil production, which boosted oil prices, while in the last three weeks California’s transition to CARB-mandated cleaner gasoline has added nearly 20 cents in a month.