thanks for all the help by the way. i have about 73000 miles on it. ive been keeping up with the oil changes. i was thinkin it was time for new air filter and i also heard new spark plugs would help. im not sure EXACLTY what my mpg is but usually if i start on a full tank i would get 350-400 until the light came on. and now i get about 300-320 from full tank until the light comes on.