My 2002 GTP Coupe has been having some issues recently in terms of gas mileage and such. The gas gauge tends to float and never be accurate at all any longer, it'll be on 3/4 tank sometimes when it's dead empty. On that same note the Fuel Used on the DIC, once it says about 16 gallons (reset every time at fill up) the car is empty and has run out a few times on me despite always filling up a full 18 gallons. Lastly, once I hit that 16 gallon mark, my Trip ODO (which I also reset at every fill up) is sitting right about 300 miles or less, which up until recently I was getting 25-27mpg most of the time. Thoughts? Ideas?