I understand that having accurate data is one of the most important aspects of any business, @easleymuse-iclou.
QuickBooks ensures 100 percent accuracy and reliability with the mileage tracker feature. However, there are factors you need to consider to ensure this feature is working properly. Some of the key ways to make sure mileage precision are listed here:
You've logged-in to your Quickbooks Self-Employed account in your mobile app, and it's working in the background.
You've enabled your mobile data.
You've got your mobile app updated.
You've enabled the GPS and the auto-mileage tracking feature in QuickBooks Self-Employed.
You've turned on the Location Settings in your phone and set the location services to High Accuracy.
Depending on the mobile device you’re using, make sure to remove the QuickBooks Self-Employed app from any battery or power-saving settings and booster.
You can refer to these articles for more troubleshooting tips about mileage tracking: