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Re: Gas Milage
If you went from some highway in warm weather to all city in the cold, then its believeable. Until your car warms up, you are in craptastic MPG mode (otherwise known as open loop), which helps everything warm up faster.
Your tires may also need more air since its cold outside. I'd also look into a tune up and air filter change, since the car is 6 years old. How many miles are on your car?
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