That chart is nearly 3 years old. Many have gone up since then.
Interactive Gasoline Map
http://www.api.org/oil-and-natural-gas-overview/industry-economics/fuel-taxes/gasoline-tax
In examining fuel prices near state borders, the prices were closer than one would think.
Indiana charges sales tax on the retail price of gasoline rather than a fixed amount per gallon.
So the amount of gas tax varies depending on the price/gal.