If you use your personal vehicle for business purposes, you are expected and required to keep track of the miles that were driven for business purposes as well as the total miles driven for the year. This information is needed to calculate either the standard mileage deduction or the actual expenses deduction for the costs of using the vehicle for business purposes.
There is not a way to enter deductible vehicle expenses without the mileage information. You can use service records (such as oil change receipts) to try to determine the total miles driven for the year. Depending on the nature of your businesses, you may be able to recreate a log for the business miles that you drove.
For future returns, you should be keeping records or a log of the miles driven for business purposes. In the event that your return is ever examined by the IRS in an audit, they may require you to provide this documentation or disallow the deduction.
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