You need to get actual miles to the tank information for us to understand how severe of a situation it is. My girl's Altima gets worse gas mileage than my old Impala and her car is in great working order, it's just that she drives ITP and is pretty aggressive, so a 2.4L gets about 21mpg. Also, are these numbers achieved around the time when we were getting ice and snow, my mpg's dropped by about four because of the slow safe driving and defrosting of windows and stuff.