The average Illinois price for a gallon of regular unleaded is $2.26. This is four cents more expensive than last week's average, according to AAA.
The most expensive gas can be found in the City of Chicago, at $2.60 per gallon. By contrast, the cheapest price per gallon can be found in Quincy, at $2.09.
Rockford's average price is $2.12 per gallon. This is one cent cheaper than last week's price.