The average Illinois price for a gallon of regular unleaded is $2.18. This is a couple cents cheaper than last week's average and is lower than the national average, which is $2.21 per gallon.
AAA reports the most expensive gas can be found in the City of Chicago, at $2.56 per gallon. On the opposite token, the state's cheapest gas can be found in Springfield; the average per-gallon price there is $2.03.
Rockford's average price is $2.14 per gallon. That’s about a nickel less than a week ago and about a quarter less than a year ago.