Can I run a milage report using the mobile app?

Running a mileage report in QuickBooks Online mobile app isn't possible since the program doesn't support this feature, Javier.

QBO app lets you see the individual trips you've made. However, generating a summary of mileage using the app isn't possible as it supports only reports like Profit and Loss and Balance Sheet.

If you need to access a detailed report of your mileage, you can access the website or browser version of QBO using a supported mobile browser. This will allow you to view a comprehensive report of your mileage, including the distance traveled, the time taken, and any associated expenses. 

For more information, you can always refer to this article: Compare mobile app features.

Also, if you want to record business miles for one or more vehicles in QBO, you can visit this article: Automatically track mileage in QuickBooks Online.

If you have other concerns about running a mileage report using your mobile app, don't hesitate to reply to this post. The Community space is always available for you.