The average Illinois price for a gallon of regular unleaded is $2.42. That's 11 cents more expensive than last week's average.
The most expensive state gas can be found in the City of Chicago, at a price of $2.76 per gallon. By contrast, the least expensive gas is in Quincy, at $2.25 per gallon.
Rockford's average price is $2.31 per gallon, which is ten cents higher than last week.