Hi, andybinmore1989-.
Allow me to share insight about tracking your miles in QuickBooks Self-employed.
Yes, QuickBooks will only consider the total miles driven when calculating the business mileage.
By default, the program will only track trips when it's open and active on your screen. This app automatically tracks trips from start to finish. Just turn on the apps and QuickBooks will handle the rest.
You can follow the steps and details in the automatic track mileage article to record your business miles and vehicle expenses in QuickBooks. Just in case you encounter an error, see the Fix mileage tracking issues in the QuickBooks Online mobile app article to troubleshoot the issue.
In addition, here are some resources that you can read to help monitor and manage your business miles and vehicle expenses in the program: Set up mileage tracking and vehicles.
Let me know if you have other questions about tracking your miles in QuickBooks. I’ll be around ready to lend a helping hand. Keep safe!