Running a mileage report is a breeze. I'd be pleased to walk you through how to do this.
In QuickBooks Online, the mileage report can be pulled up by clicking on the Download Trip button from the Trips page. This will open a report in Excel file that shows all the trips that you've entered.
To do that, just open the trips page and press on Download Trips. Please see the screenshot attached for your reference:
I understand the benefit of being able to generate a detailed mileage report in your QuickBooks account. Currently, you can click on the View Vehicle link in the Mileage Dashboard. From here, you'd be routed to page where you can see a list of vehicles you've use to track your business-related mileage. You can refer to the screenshot below:
Also, I'd recommend visiting our QuickBooks Blog so you'd be updated once new enhancements in the mileage feature is available.
Lastly, you can read through these articles to learn more about this new mileage feature: