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Q: My car was parked for a while, now the gas mileage is worse than before

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i parked it for a month with the battery unplugged then I fournd out that it consumed too much gas than before .I change the air filter and the tires .the problem endures.,I checked it . no leaks.it is said that it needs reprogramming after unplugging the battery.is that right?

My car has 59000 miles.
My car has an automatic transmission.

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