The average gasoline prices in Illinois have fallen by 10.2 cents per gallon in the last week, averaging $4.14 per gallon according to GasBuddy. Gasoline prices in Illinois are 51.5 cents per gallon lower than gasoline prices a month ago, but 87.5 cents per gallon higher compared to prices a year ago. 

The cheapest station in Illinois was priced at $3.45 per gallon on Sunday. The most expensive station was priced at $5.87 per gallon, with a difference of $2.42 between the two stations. 

The national average price of gasoline has fallen by 5 cents per gallon, averaging $3.81 per gallon. The national average is down 39.8 cents per gallon, but is 69.1 cents per gallon higher than prices a year ago. As for diesel prices, the national average has risen by 7.3 cents per gallon in the last week and prices stand at $5.04 per gallon according to data collected by GasBuddy. GasBuddy data covers over 150,000 gas stations across the country.