The average state price for a gallon of regular unleaded gas is $2.57. That's nine cents lower than last week's average, according to AAA.
The most expensive gas in the state can be found in the City of Chicago, at $2.99/gallon.
The cheapest gas in the state can be found in Davenport-Moline-Rock Island, at $2.33 per gallon.
Finally, the average price of a gallon of unleaded gas in Rockford is $2.55.