IRN – Gasoline prices continue to fall in Illinois. 

The average price of a gallon of gas in the state is $3.43. That is 38 cents cheaper than a month ago, and 52 cents a gallon lower than a year ago. 

According to AAA Illinois, the cheapest gas is in Effingham County at $2.89, while the most expensive is Cook County at $3.65. 

The national average is $3.20 a gallon.