The average Illinois price for a gallon of regular unleaded is $2.25. This is one cent cheaper than last week's average.
AAA reports the state's most expensive gasoline can be found in the City of Chicago, at $2.62 per gallon. By contrast, Decatur has the state's cheapest gasoline, at an average price of $1.99 per gallon.
Rockford's average gas price is $2.13 per gallon.