According to the American Petroleum Institute, the national average gas tax as of its January 1, 2017 quarterly update is 49.44 cents per gallon. This consists of the following:
- State excise taxes: 21.3 cents
- Other state taxes: 10.01 cents
- Federal excise taxes: 18.40 cents
South Carolina’s gas tax is less than that, at 35.15 cents per gallon, because the Palmetto State’s portion is so much lower than the national average:
- State excise taxes: 16.00 cents
- Other state taxes: 0.75 cents
- Federal excise taxes: 18.40 cents