The average U.S. price for a gallon of regular gasoline didn’t change much in the past week, but it did drop a penny, as the average nationwide for a gallon of regular is at $3.42. A year ago it was $3.55 per gallon, as it was dropping.  In Illinois the average for a gallon of regular gas is up 6 cents to $3.61 from a week ago, that is up again as it rose 5 cents the previous week.