Given the facts as you have presented them, it is deductible mileage.
Here is what the IRS says:
"If you have one or more regular work locations away from your home and you commute to a temporary work location in the same trade or business, you can deduct the expenses of the daily round-trip transportation between your home and the temporary location, regardless of distance.
If your employment at a work location is realistically expected to last (and does in fact last) for 1 year or less, the employment is temporary unless there are facts and circumstances that would indicate otherwise."
Publication 463 (2019), Travel, Gift, and Car Expenses
@sgilby
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