The average Illinois price for a gallon of regular unleaded is $2.27. This is identical to last week's average.
AAA reports that the City of Chicago has the state's most expensive gas, at a price of $2.65 per gallon. Meanwhile, the cheapest gas can be found in Springfield, costing $2.11 per gallon.
Rockford's average per-gallon price is $2.20. This is three cents cheaper than last week's average.