Step 4: General information
If you used two vehicles for business during the year, use a separate column in Steps 4, 6, and 7 for each vehicle. If you used more than two vehicles, complete a second worksheet.
Line 11: Date placed in service is generally the date you first start using your vehicle. However, if you first start using your vehicle for personal use and later convert it to business use, the vehicle is treated as placed in service on the date you start using it for business.