How can I effectively track my fuel consumption in my Audi A2?

I recently bought an Audi A2 and want to keep track of my fuel consumption for better budgeting. However, I'm not sure which method to use to accurately track this. Can anyone provide some advice?

One of the best ways to track fuel consumption in your Audi A2 is by using the onboard trip computer. This feature calculates your average fuel consumption and displays it on your dashboard. It also allows you to reset the data at any time to track specific trips or periods