The average price of a gallon of regular gasoline nationwide dropped ever so slightly in the past week.  Gas was at $1.99 per gallon, down a penny, while it was at $2.19 per gallon one year ago.  There was a no increase in Illinois though for the past week, as it remained at $2.01 per gallon of regular for the second week in a row.  It remains at $1.79 per gallon of regular gas in Nashville for the past several weeks.