Why is my Vauxhall Vivaro's fuel economy decreasing?

I have noticed that my Vauxhall Vivaro's fuel economy has been decreasing over the past few months. What could be causing this and what steps can I take to improve it?

First, I recommend checking your tire pressure. Under-inflated tires can decrease fuel economy. It's also important to regularly change your air filter and keep up with routine maintenance.

Another factor to consider is your driving habits. Avoid unnecessary idling and aggressive driving, as these can greatly impact fuel economy. Also, try to plan your routes efficiently to minimize time spent in traffic.

You may also want to check for any potential leaks in your fuel system. A leak can cause a decrease in fuel economy and can be a safety hazard. If you are unsure how to check for leaks, it's best to take your vehicle to a trusted mechanic.