California’s excise tax on gasoline will increase to 51.1 cents per gallon July 1, up from the current 50.5 cents per gallon, the California Department of Tax and Fee Administration announced this week. The tax on diesel fuel also will increase, reaching 38.9 cents per gallon (up from 38.5 cents per gallon). “We are required to adjust the motor vehicle fuel and diesel fuel excise tax rates on July 1 of each year, based on the percentage change in the…