[cableguymn]

It’s been mentioned here that in IL there are sales taxes on gas.

http://illinoishomepage.net/fulltext/?nxd_id=245117

mentions there are 7 states that charge a sales tax. You likely have not noticed this because the sales tax is included in the price per gallon at the pump.

[org.whodat]

All states have sales and other tax on fuel, but it is computed different in each state. That is why trying to establish a nationwide average is horse manure. Also lots of the fuel sold is for non-highway usage, but there is no paperwork to establish the real amount.