Fuel taxes in the United States*vary by state. The United States federal*excise tax*on gasoline is 18.4 cents per gallon (4.86*¢/L) and 24.4 cents per gallon (6.45*¢/L) for*diesel fuel. On average, as of January 2013, state and local taxes add 30.4 cents to gasoline and 30.0 cents to diesel for a total US average fuel tax of 48.8 cents per gallon for gas (12.89*¢/L) and 54.4 cents per gallon for diesel (14.37*¢/L).The state and local tax figure includes fixed per gallon taxes as well as taxes that are a percentage of the sales price. For state-level fuel taxes, thirteen states levy taxes based on a percentage of the sales price, while Florida levies a tax with the rate tied to the Consumer Price Index.*The other thirty six states and the District of Columbia do not tie their tax rates to inflation or gas prices, and only see their gas tax rates rise when lawmakers vote to raise them. As of December 2011, twenty six states had gone ten years or more without an increase in their gasoline tax rate.