First the questions:

1. Standard mileage rate or
2. Actual costs

Next, the entity question:

1. Self employed or
2. LLC or S Corp or C Corp

Next documentation:

1. Using GPS app log ?
2. Paper log ?
3. If corp titled, is there mixed pers/bus use ?

Well here you go:

• http://www.watsoncpagroup.com/kb/Automobiles-and-LLCs-S-Corps_169.html