If you're an employee and receive a W-2, you can deduct unreimbursed vehicle expenses as job expenses, but you must be able to itemize your deductions. Even then, only the amount above 2% of your adjusted gross income (AGI) is deductible.
Please note that you can't deduct the miles you use when commuting to and from work, or any expenses you were reimbursed.
We guide you through itemized deductions under Deductions & Credits.