California Drivers will see a new gas tax when they purchase after July 1st. The current tax on gasoline in California is 41.7 cents per gallon. With the 5.6 cent increase, the tax amount per gallon will be 47.3 cents per gallon or 13% of the average per gallon charge. Prices have been going down in the past week in the area and was 3 dollars and .74 cents a gallon. This represented a drop of 8 cents a gallon for the week. The new tax will run it up 14% the first day. Welcome to California.