The average price of a gallon of regular gasoline nationwide saw no change in the past week.  Gas remains at $1.71 per gallon, while it was at $2.32 per gallon one year ago.  There was a decrease in Illinois for the past week, as it went down from $1.66 per gallon of regular to $1.63.  There was also no change in Nashville, as it remained at $1.56 for the past week.