This thread is old. Despite the June, 2019 date, the answer only applies to 2017 and earlier tax returns.
A W-2 employee's ability to deduct mileage, and other job expenses, was eliminated starting in tax year 2018. This also applies to mileage between two different jobs.
So, unless one of you jobs is as a contract employee (you get a 1099-Misc, instead of a W-2), nothing is deductible
Even in the "old days", it was only a misc. itemized deduction, subject to the 2% of AGI threshold.
