Anyone who drives around on business should be renting a vehicle instead of driving their personal property. It is all a write-off; None of the wear and all the tear is done to your property. 
When I tried out the local office of the National chain RentAwreck car rental agency in Norman Oklahoma the wreck John Carson put me in was better than the one I was driving.  So if you want to save money, click on the national RentAwreck symbol for more information.  His toll free number is (877) 364-7407