The average Illinois price for a gallon of regular unleaded gasoline is $2.49. This is ten cents cheaper than last week.
The state's most expensive gas can be found in the City of Chicago, at $2.91 per gallon. By contrast, AAA reports the cheapest gas is in Springfield, at $2.29 per gallon.
Rockford's average price is $2.47 per gallon. This is 7 cents cheaper than last week.