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Welcome to the forum. You have to remember that a car needs to get up to temperature in order to perform well, short trips don't allow it to run efficiently. I believe these cars are rated at 19 City and 28 Highway so you're at the average mileage.
You will find as the weather warms that the mileage will improve slightly. Take it out on the highway and it will improve greatly. Another thing to watch for if you continue short trips is a substance called Mayo under the oil cap. This is the condensation build up from not getting up to temperature for an extended period of time. Taking your car out on a longer trip will get rid of it.
The white smoke may be from the cold weather, I'd keep an eye on it and see if it goes away as spring approaches. Did you have a mechanic look at the car before buying? Many people have a Pre Purchase Inspection done so they can avoid known issues with these cars.
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