I work for a bank and work from home. I travel to review branches for work. I get reimbursed for mileage outside my normal commute. Can I deduct the other mileage?

I was hired as an employee for a city 99 miles from where I live. I have to subtract 99 miles from my total miles each time I drive for work, then will get reimbursed for the remaining miles. So if I drive 150 miles in a day, I get reimbursed for 51 miles. Can I take a deduction for the 99 miles each day that I don't get reimbursed for?