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Why is my BMW 3 Series's fuel efficiency decreasing?

I have noticed that my BMW 3 Series's fuel efficiency has been decreasing lately. What could be causing this and how can I improve it?

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M

The decrease in fuel efficiency could be due to a clogged air filter or dirty fuel injectors. I would recommend getting these checked and cleaned if necessary by a certified mechanic.

K

Another possible cause could be low tire pressure. Make sure to regularly check and inflate your tires to the recommended pressure.

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