QB Issue Resolution:

There is a Delete vehicle mileage entry in the Edit menu when you have the enter mileage window up. At first I thought I saw a bug there but nope – it works as designed.

Resolution for Issue 'How to delete mileage already entered?' available: Yes (Solved).
Source: Intuit Community forum.

How to delete mileage already entered?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for mileage
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Error Recovery for mileage [Canada]
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