The average Illinois price for a gallon of regular unleaded gasoline is $2.29. This is three cents cheaper than last week's average.
AAA reports the most expensive gas in the state can be found in the City of Chicago, at $2.68 per gallon. By contrast, Decatur has the cheapest gas, at a price of $2.12 per gallon.
Rockford's average per-gallon gas price is $2.18. This is identical to last week's average.