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When it comes to tracking mileage for tax purposes, you should generally focus on tracking mileage for business or deductible purposes rather than personal trips. Here's why:

1. Tax Deductions: The primary purpose of tracking mileage is to claim tax deductions for expenses related to your vehicle's use for business or other deductible activities.
2. IRS Requirements: The IRS requires detailed records and documentation to support mileage deductions.
3. Audit Risk: If you claim mileage deductions without proper documentation, you may face an increased risk of IRS audits.

However, it's worth noting that in some specific situations, personal trips can be indirectly related to deductible activities:

1. Commuting from a home office: If you have a home office and your daily commute begins and ends there, you may be able to deduct mileage for business-related travel within your workday, such as client meetings or site visits.
2. Combining business and personal trips: If you have a single trip that includes both personal and business components, you can generally deduct the mileage related to the business portion of the trip. However, you need to maintain clear documentation and be able to substantiate the business purpose of the trip.

In summary, it's advisable to primarily track mileage for business or deductible activities to ensure accurate tax deductions and compliance with IRS regulations. Personal trips, such as daily commuting or non-deductible errands, are generally not eligible for mileage deductions. If you have complex situations where personal and business mileage overlap, consult with a tax professional for guidance on how to handle these scenarios correctly.