The average Illinois price of a gallon of regular unleaded is $2.12. This is two cents higher than last week's average, according to AAA.
The most expensive gas is in the city of Chicago, at $2.52 per gallon. By contrast, the state's cheapest gas can be found in Danville, at $1.91 per gallon.
Rockford's average per-gallon gasoline price is $2.07. This is nine cents more expensive than last week's average.