What Is the Federal Gas Tax? How Much Is Gas Taxed in Philly Pennsylvania drivers pay some of the highest gas taxes in the nation — nearly 58 cents a gallon at the state level — while the federal rate adds another 18 cents on top. Original Source: https://www.moneytalksnews.com/what-is-the-federal-gas-tax-how-much-is-gas-taxed-in-philly/