In most states, the gasoline tax is set at a fixed number of cents per gallon of gas. South Carolina drivers, for example, have been paying 16 cents per gallon in state tax for more than a quarter century.1 But while this type of fixed-rate gas tax may appear to be flat over time, its lack of change in the face of inflation means that its “real” value, or purchasing power, is steadily declining. In ten states, this decline has brought the state’s inflation-adjusted gas tax rate to its lowest level in the state’s history.
