Cool, thanks for the reply jms, makes sense for the most part.
So, when buying gas, aside from import costs to each specific states and the other factors, here's the cost per a gallon in taxes for the 5 most cheapest and expensive states.
The top 5 cheapest gas taxes are (in dollars/gallon):
New Jersey $0.145
The top 5 most expensive taxes (in dollars/gallon):
New York $0.4577
Rhode Island $0.30
BTW, Missouri, mullethunter, is at $0.017 (that's eighth, tied with New Mexico).
EDIT, however, if you read the detail for each state (from the link provided by jms), you'll notice that some have added county, enviromental, and blablablabla taxes that aren't included in the state gas tax. Kinda makes it confusing, doesn't it?