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If you have missing records - the only way to support your deduction would be to re-establish mileage log.
Without supporting documents - your travel deductions will be simply disallowed.
Even if you re-establish the mileage log that will NOT guarantee any positive outcome.
You need to be very precised.
See for instance here
In this case - a real estate broker, who deducted car expenses, but the IRS audited him and disallowed the entire deduction.
He did not keep a detailed mileage log but when he learned he was being audited by the IRS, he created a handwritten mileage log with a list of places he claimed to have driven. The Tax Court found that records weren’t sufficient and denied the entire deduction.
As an example - see page 27
Table 5-2. Daily Business Mileage and Expense Log
That is an example of the mileage log acceptable by the IRS.
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