The average Illinois price for a gallon of regular unleaded is $2.43. This is six cents cheaper than last week's average, according to AAA.
The state's most expensive gas can be found in the City of Chicago, at $2.80 per gallon. By contrast, Springfield has the cheapest gas, at $2.26.
Rockford's average price is $2.35 per gallon. This is 3 cents cheaper than last week's average.