Adam HofferJacob Macumber-Rosin at the Tax Foundation:

California pumps up its gas tax the most at 68.1 cents per gallon (cpg), followed by Illinois (66.5 cpg) and Pennsylvania (58.7 cpg). The lowest gas tax rates are levied in Alaska at 8.95 cpg, followed by Mississippi (18.4 cpg) and Hawaii (18.5 cpg). These rates don’t include the effects of cap-and-trade carbon policies or low carbon fuel standards, which drive prices even higher in California, Washington, and select northeastern states.