I have a 2003 VW Jetta GL 2.0 Liters, and i've been experinceing very low MPG. On a full tank of gas the MGP should atleast be 22-24 MPG or around (310 miles). Well i've only been avergaing 14-15 MGP or around 200 miles. Thats very low compared to what was average by VW. Also, its very frusrating because your paying for this gas and its not paying off for you. At first i thought it could be the oil but i changed that a week ago and im stilling having the problem. I've been having this problem for about 2 months. I know nothing about cars so i don't know what to do. Can someone hlep me. Thanks.