Your employer does provide an office and if your employer does not reimburse you for mileage expense, pay for your gas or provide you with a vehicle to travel to job sites excess miles are deductible as an Employee Business Expense on form 2106. In order to benefit from this you will need to itemize.
The IRS requires that you keep a mileage log to record the to & from. If the mileage from your home to your employer's office is 8 miles and you travel 10 miles to the first job then your additional commute would be 2 miles, but if you travel from that job site to another, and another all the other mileage will be added to the 2 miles. Always keeping in mind that the commute from your home to your work office and back home are not deductible. Therefore if in one day you travel 100 miles and your round trip to and from work is 16 miles your deductible miles are 84 miles.
As for the 1099 that you received what box is the amount recorded in #3 or #7?
