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Originally Posted by GTP Dad
Welcome to AF!!
There are many causes of bad fuel mileage in a car but one that usually comes to mind besides a lead foot involves the O2 sensor. If the sensor is going bad it does not properly read the O2 in the exhaust stream and causes the computer to allow more fuel into the engine and thus reduces the amount of mileage you are getting. I would change the front O2 sensor on the car and see what happens. Also watch your driving habits and idle times on cold mornings. You should see an improvement.
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Thanks for your reply's! I ended up talking to a mechanic at the local pontiac dealership and he said the bad gas mileage was extremely common during the cold months. He said also said the "check engine light" should be coming on if the 02 sensor was bad. Maybe I will wait a while and see what the mileage is like when it warms up a bit more. So far it hasnt seemed to make that much of a difference though...