Hi there,
Making sure your expenses are categorized properly is an important step in your bookkeeping. QuickBooks Self-Employed can help you keep track of how much mileage on your vehicle is personal and how much is business. I can help you with that.
When adding a trip or categorizing it from the trips brought in from the mobile app, you will be asked if it's a personal or business trip. You'll be able to go to the Reports section and select the Mileage Log in order to view the usage of your vehicle. You'll be able to see totals of both personal and business trips in this report.
I hope this helps. If you have any further questions, feel free to reach out here.