Good news comes to the way of the gas pumps in Central Illinois, as GasBuddy.com says the average price of gas in Illinois fell 7.7 cents in the past week – down to $2.58 a gallon. The national average is $2.34. In Shelbyville gas is at $2.45 a gallon – in Monticello $2.38. Aslo according to GasBuddy.com, some gas stations in Decatur have gas as low as $2.27 a gallon.