Can I deduct vehicle mileage if my employer reimburses me 20 cents/mile?

I drive to multiple locations for work.  My employer reimburses my mileage at 20 cents per mile.   Can I still deduct anything since it is well below the 51 to 55 cents per mile set forth by the IRS?  Can I clam the difference between the two amounts?
    If you get less than the standard federal amount, you can claim it. You figure your total miles for each half of the year (because the reimbursement rate changed mid-year) and enter those. Then at the end of the entire section of work related expenses, it will ask you what you were reimbursed by your employer. if you were not reimbursed at the standard federal rate, you will be able to claim some of it.
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