Right - what I meant was that it is "my" car and already paid for. But instead of writing off mileage, I'll just lease my own car to my business, thus deducting my "lease payment" along with gas and maintenance.
You have to be careful with that. While it's true that you can lease the car to your company it's also true that you can only charge what is fair and reasonable for a similar lease for that car. If the car generally leases to someone for $299 and you charge your business $500 you may have a problem. You also still need to log your mileage to prove the usage is for business.