Employee business expenses, including vehicle expenses, are not deductible on a federal tax return due to the tax code changes in effect for tax years 2018 thru 2025.
Even under the old rules, there was not much of a deduction for W-2 employees. You were allowed to deduct your mileage (53.5 cents for 2017) and other job expenses, subtracting what you were reimbursed. TurboTax completed form 2106, which then carries to Misc itemized deductions on Schedule A. The problem with this is that you only get to deduct that portion of your misc deductions that exceed 2% of your AGI. and then only if your total itemized deductions exceed the standard deduction. (2% rule explained: https://ttlc.intuit.com/questions/2902781-what-is-the-2-rule)
In addition, "commuting" miles were not deductible. The trip from your home to your first client and the trip home from the last client of the day were not deductible. Only the in between trips were deductible.