Good detailed daily written records of all mileage business and personal so that you could determine the percentage of business mileage use versus the personal use and the commuting use.
You already know the rules when you say you already deduct the daily mileage for the corolla business use.
Are you an employee that has an employer?
Information on use of cars. If you claim any deduction for the business use of a car, you must answer certain questions and provide information about the use of the car. The information relates to the following items.
* Date placed in service.
* Mileage (total, business, commuting, and other personal mileage).
* Percentage of business use.
* After-work use.
* Use of other vehicles.
* Whether you have evidence to support the deduction.
* Whether or not the evidence is written.
Employees must complete Form 2106, Part II, Section A, or Form 2106-EZ, Part II, to provide this information.
Use the search box at www.irs.gov for Publication 463
Hope that you find the above enclosed information useful