The Gas Tax by state ranges from 14.65 cents per gallon to 57.6 cents per gallon. For diesel, the tax ranges from 12.75 cents per gallon to 74.1 cents per gallon. In general, there is a high correlation between gasoline state tax and diesel state tax.
Pennsylvania is the high outlier for both gas tax (14.65 cents per gallon) and diesel tax (74.1 cents per gallon). Alaska is the lowest prices, though not an outlier, for both gas tax (14.65 cents per gallon) and diesel tax (12.75 cents per gallon).
The average gas tax by state is 29.15 cents per gallon. 23 states have gas taxes higher than that average, and 27 states have gas taxes lower than that average. This means that the gas tax is relatively well distributed throughout the US—it skewed only slightly toward states with lower taxes.
The average diesel tax by state is 30.46 cents per gallon. 21 states have diesel taxes higher than the average, and 29 states have diesel taxes lower than the average. This is more skewed than the gas tax, and states tend to have lower-than-average taxes for diesel.
21 states have a diesel tax that is exactly the same as it’s gas tax, with a few more being within .5 cents. 6 states (Pennsylvania, California, New Jersey, Ohio, Arizona, and Indiana) have diesel taxes which are significantly higher (greater or equal to 5 cents per gallon) than their gas tax. The greatest disparity is in California, where diesel tax is 19.3 cents per gallon higher than the diesel tax.
While several states have diesel taxes that are only marginally lower than their gas tax (within 2 cents per gallon), only Illinois has a diesel tax that is significantly lower than it’s gas tax. Illinois’s diesel tax is 16.5 cents per gallon lower than its gas tax.
The geographical correlation for gas taxes is relatively weak, but in general the West Coast has the highest prices, followed closely by the East Coast. The inland United States is generally split north to south, with the north generally having higher taxes than the south. Both Hawaii and Alaska have the lowest gas taxes.