Hello I just purchased a 91 Dodge Spirit With 97,000 miles( yes it was owned by little old lady who only drove the church and the grocery store) I was told these cars get 25 to 30 miles per gallon it has a 2.5 liter motor in it. 4 cylinder I Drive a hundred miles a day back and forth to work I would like to know if there's any little thing I can do to a 2.5 liter motor that will help me get better fuel economy I was thinking of a K&N filter with a cold air intake maybe switch to amsoill motor or all synthetic maybe put some better spark plugs in are there any other little things I could do to help the fuel mileage besides not running air conditioner are getting rid of non needed weight in the car