Gas prices continue to go down in Illinois. Here’s a look at where to find the lowest gas prices around New Lenox. (Shutterstock)NEW LENOX, IL — New Lenox residents are getting a little relief at the pump with gas prices down heading into Easter weekend. The average price of gas in Illinois was at about $4.33 per gallon Friday, according to AAA. That’s down 10 cents from a week ago.In Will County, the average price for a gallon of gas was around a nickel under the state average on Friday at about $4.