Make sure you check the tires cold. You just had them put on IIRC. If they aired them up in a warm shop, they won't be the same outside. When the temp drops the air is denser it takes more to push your car through it. The fuel filter is back by the tank. An o2 sensor will screw up mileage as well. Even though it's not throwing a code it can still not read corectly messing with you a/f ratio burning more fuel.
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What a great damn day, I can walk!
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