<P> The United States federal excise tax on gasoline is 18.4 cents per gallon and 24.4 cents per gallon for diesel fuel . The federal tax was last raised in 1993 and is not indexed to inflation, which increased by a total of 64.6 percent from 1993 until 2015 . On average, as of January 2017, state and local taxes and fees add 31.04 cents to gasoline and 31.01 cents to diesel, for a total US average fuel tax of 49.44 cents per gallon for gas and 55.41 cents per gallon for diesel . </P> <P> The first US state tax on fuel was introduced in February 1919 in Oregon . It was a 1 ¢ / gal tax . In the following decade, all of the US states (48 at the time), along with the District of Columbia, introduced a gasoline tax . By 1939, an average tax of 3.8 ¢ / gal (1 ¢ / L) of fuel was levied by the individual states . </P>

When was the federal gas tax last raised