The average price of a gallon of regular gasoline nationwide dropped again in the past week.  Gas was at $1.77 per gallon, down from $1.82, while it was at $2.11 per gallon one year ago.  There was a larger decrease in Illinois for the past week, as it dropped from $1.71 per gallon of regular to $1.63.  There was a small drop in Nashville from $1.59 to $1.57 per gallon of regular gas for the past week.