We appreciate and have taken note of your feedback , Seppo. 

While using it is unavailable for other users, you might want to consider using one of the available third-party apps in our App Store. Just go to the Apps menu and proceed to the Find Apps tab. 

Please know that all of the apps that you can see in the App Store can be seamlessly integrated with QBO. 

I can also see that feature requests have already been shared to our product engineers with regards to the Mileage feature. It's also best if you can share your feedback directly to them by clicking the Share feedback button within the Mileage menu. The more feedback and request they receive about this, the more chances it'll be considered in the future updates. 

We'll let you know once an update is available. You can also reach out to us again anytime you require help when working in QBO.