ILLINOIS -- Gas prices are continuing their slow march toward the $4 mark.
AAA says the average price in Illinois is now $3.89 a gallon.
That's 15 cents higher then a month ago and 7 cents higher than the same time last year.
In Peoria County, the average price is $3.68. That's up 5 cents from a year ago.
McLean County is at $3.65, up 12 cents from last year.
AAA blames refinery maintenance for the higher prices.