1.4. All states impose excise taxes on gasoline. According to data from the Federal Highway Administration, the state of California imposes an excise tax of $0.18 per gallon of gasoline.

In 2005, gasoline sales in California totaled 15.6 billion gallons. What was California’s tax revenue from the gasoline excise tax? If California doubled the excise tax, would tax revenue double? Why or why not?