Although the national average tax rates were nearly flat, several states saw changes. Gasoline taxes decreased in three states, with Kentucky having the largest decrease, falling US$0.023 to US$0.2780/gal. Gasoline taxes increased in nine states, with Indiana having the largest increase of US$0.044 to US$0.5610/gal.
Diesel fuel taxes decreased in four states, with California’s tax decrease of US$0.0420 being the largest. Diesel taxes increased in eight states, with the largest increase in Colorado, which rose by US$0.0263 to US$0.3068/gal.
Federal tax rates remain at US$0.1840/gal for gasoline and US$0.2440/gal for diesel, which includes excise tax and an additional US$0.001/gal from the Leaking Underground Storage Tank Fund.
The same three states had the lowest gasoline and diesel taxes: Alaska (both at US$0.0895/gal), Mississippi (both at US$0.1840/gal), and Hawaii (both at US$0.1850/gal). The three states with the highest gasoline taxes were California (US$0.6982/gal), Illinois (US$0.6710/gal), and Pennsylvania (US$0.5870/gal). Those same three states also had the highest diesel taxes: California (US$0.9212/gal), Illinois (US$0.7460/gal), and Pennsylvania (US$0.7410/gal).
The EIA updates information about federal and state motor fuel taxes in the US on a semiannual basis, based on tax rates at the beginning of January and July each year.