Yesterday i noticed that when i have my car at idle and if i hit the gas a lil bit to hear the growl, i use fuel very quickly. with my mpg at only 15.6 mpg on the highway with me cruising at 70-75, i must need a new fuel filter. so I just wanted to know the best brand of fuel filter to get or what brands to stay away from for my 97 mark. Am i am going to change my airfilter also.