The average Illinois price of a gallon of regular unleaded is $2.31. This is two cents more expensive than last week's price.
AAA reports the most expensive gas is in the City of Chicago, at $2.62 per gallon. By contrast, gas is cheapest in Decatur, at $2.15 per gallon.
Rockford's average price is $2.22 per gallon. That's three cents cheaper than last week's average.