I am getting the same mileage on my car as when I first bought it. The fuel gauge shows that the gas is being used faster and when I fill the tank, it doesn't seem to fill in quantity as high as it used to (14 US gallons now vs. 16-17 before). I have recently (about 1 1/2 years ago) replaced the O2 sensor, pvc filter, and there are no knocks or pings of the engine. I also religiously change my oil/filter ever 3,000 miles. Additionally, my back brakes squeal really loudly and have had them checked and found they still have about 80% life left on the pads. And, I have a "wobble" kind of sound in the rear when going over a speed bump or something<<< could this be related to worn shocks/struts?
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This may be a fuel gauge issue. If the gauge reads empty and there is still a few gallons in it, then you will add less when filling it up, and you will get less miles from a tank of gas (because you are not using those few gallons).
First thing I would do is get a bottle of Chevron Techron and add it to a full tank, this stuff will actually clean the fuel gauge sending unit in the tank, and it will also help to clean the injectors as well. learn more here: http://bit.ly/Techron_Concentrate
This will cost around $10 so it's an easy, inexpensive way to possibly get this resolved.
If this doesn't help, then you'll need to have the fuel gauge and sending unit checked out to see that they are OK.
