Why is the Ford Mondeo's mileage decreasing?

I have been noticing that the mileage on my Ford Mondeo has been gradually decreasing. I have been getting the car serviced regularly and haven't noticed any major changes in my driving habits. What could be the reason for this and how can I improve it?

It is possible that there is an issue with your car's fuel injectors. As they get clogged over time, they can affect the fuel efficiency of your car. It is important to get them cleaned or replaced if necessary.

Another factor that could be affecting your car's mileage is the air filter. If it is dirty or needs replacing, it could be restricting air flow and causing your car to consume more fuel. Make sure to check and replace the air filter regularly.