I'd talk to a CPA on this. There are going to be multiple answers depending on your situation. I am not sure what area asking because you mention own a business or W2. Two different things as you know.
I can only speak from my experience whereas I am incorporated as an S-Corp and an employee of my own company. So, my CPA deducts expenses of running the car for "business" purposes. Since the car is for both business and personal, he declares what percentage of travel is business and what part is personal. Get's even more complex. In later years, to simplify things, I just used a standard mileage deduction. Again, better talk to a CPA. I don't think there is any simple answer unless you give more specific examples. Good luck.