You will enter the gas, oil changes(maintenance/repairs), and tires as actual expenses for your vehicle. Your motorcycle will be entered as a second vehicle. Please use the steps below as a guide to enter the expenses and second vehicle.

Follow the instructions below to enter actual expenses:

1. Select "Federal Taxes" at the top of the page

2. Select the "Deductions & Credits" sub-tab

3. Scroll down to "Employment Expenses" and select "Show More"

4. Select "Start/Revisit" next to "Job Expenses for W-2 Income"

5. Select "Edit" next to your occupation(Or enter it when asked)

6. Continue forward through the screens answering the questions to enter your vehicle information and to enter mileage

7. After entering your mileage you should arrive to a screen asking "Do You Want to Enter Your Actual Expenses?", answer "Yes". On the next page enter your gas, oil, and tire expenses

8. When you're finished with this vehicle's expenses you should come to a "Vehicle Summary" page where you can select to "+Add a Vehicle"

9. Proceed to enter your motorcycle and go through the interview questions

Visit this IRS link for a more complete explanation on how to claim job-related vehicle mileage and expenses:
https://www.irs.gov/pub/irs-pdf/p463.pdf